Eclipses Made Easy to the Minds and Capacity of the Young

That is the soothing promise made in the title of a booklet published in London in 1836, in anticipation of the annular eclipse that would be visible in the northern part of Great Britain on May 15 of the same year. As the clock is ticking steadily towards the total solar eclipse of August 21, 2017, Team Cotsen became curious about how exactly eclipses and other astronomical knowledge have been explained to children in the past. Were eclipses truly made easy to understand for them?

To be honest and fair, even in the digital era when information is purportedly one click away, and with the aid of instructional animations and videos freely available on the Internet, my not-so-young mind/head starts spinning whenever it tries to hold the image of Earth rotating on its axis as it revolves around the Sun–which, mind you, is not still but just as busily carries on with its own rotation while whizzing around the center of the spiral Milky Way Galaxy. To understand the business of eclipses, you will have to visualize, in three-dimensional space, how the Moon orbits around Earth, but on a tilted plane relative to Earth’s orbit until it should circle to such a sweet spot as to be aligned with both Mother Earth and Apollo.

Left: The Moon is above the horizon of the Princeton area from 5:57am to 7:52pm on August 21, 2017.
Right: The sun rises at 6:16am and sets at 7:47pm on that same day.
(Sources: Timeanddate.com; Helpingwithmath.com)

You will have to make sense of the fact that, on the day of a solar eclipse, the Moon is actually hanging out in the sky in broad daylight, patiently abiding its time to ambush the sunlight. On August 21, 2017, for example, the Moon works a day shift in the Princeton area, rising at 5:57 am and disappearing off the horizon at 7:52 pm—on a schedule similar to the Sun’s. (May this be called “sunlighting”?)

Last but not least, a crucial piece of information that is mentioned less often is that totality is made possible by a mathematical coincidence of the distance and sizes of the Sun and the Moon. The “tiny” Moon, with a diameter about 1/400 of that of the Sun, is able to briefly block our view of the gigantic fireball, because the latter happens to be about 400 times as far from Earth as the Moon does. (I learned this from a talk given by Dr. Amitava Bhattacharjee, Princeton professor of astrophysical sciences, to a full house of eager listeners in the Princeton Public Library.)

Keeping in mind the complexity of solar eclipses and subsequently the challenge of negotiating simplification and accuracy for a child audience, let’s examine a few titles on astronomy from the Cotsen collection. The purpose is not to evaluate how thoroughly eclipses are explained, but to draw attention to features that add to the interest level and the diversity of ways science can be taught to children. Some of the features still hold fresh, engaging and aesthetic appeals a century or two later, even as all the content of the books don’t necessarily stand the strict test of scientific advancement.

Eclipses Made Easy: The Harmony Between Astronomy and God

Eclipses Made Easy to the Minds and Capacity of the Young / by the Rev. W. Fletcher. 2nd edition. London: N. Hailes, 1836. (Cotsen 20585)

Eclipses Made Easy to the Minds and Capacity of the Young was written by the Reverend William Fletcher, who had taught in St John’s College, Cambridge. He was also the author of a grammar book published in 1828. The title, The Little Grammarian, or, an Easy Guide to the Parts of Speech, And Familiar Illustrations of the Leading Rules of Syntax: In a Series of Instructive and Amusing Tales (Cotsen 19946), conveys a similar intention of providing accessible and interesting instructions to children.

Published in April 1836, a month before the upcoming annular eclipse, and already in its second edition, Eclipses Made Easy capitalized on the peaking curiosity of young people in a rare celestial phenomenon to teach astronomy. As a prominent theme throughout the Reverend’s writing, the harmony among the study of astronomy, reason, and faith is emphasized. Fletcher wrote in the beginning paragraph,

I beg to present my juvenile readers with a few such simple observations on Eclipses in general, as may serve not only to inform their minds on the subject, but also lead them in after days to a more intimate knowledge of that sublime science, Astronomy, which has for its primary objects the promotion of the honour and glory of God, and the convenience, comfort, and mental improvement of man. (Fletcher 2)

Later in the book Fletcher (31) would give examples of the “ancient follies and phantoms of superstitious ignorance” in people’s anxious interpretations of eclipses. He even quoted from John Milton’s Paradise Lost, gently disapproving the poet for “subscribing in his immortal verse to the erroneous superstition of the times” (35). Milton’s reference to an ominous solar eclipse is made in lines about Satan’s appearance–“In dim eclipse, disastrous twilight sheds / On half the nations, and with fear of change / Perplexes monarchs”–from Paradise Lost (1667), Book 1, lines 597-599, as quoted by Fletcher (36).

The booklet covers an impressive number of knowledge points important for the understanding of eclipses. The first piece of information Fletcher (5) taught was that Earth and other planets revolve around the Sun! More than two centuries had lapsed after Galileo’s telescopic observations yielded evidence for heliocentrism, but it was still no trivial matter that what he championed was no longer classified as heretical but passed to children by a member of the clergy. Fletcher explained how long it takes the Moon to complete a circle around Earth: “29 days, 12 hours, 42 minutes nearly” (8), which is two minutes shorter than our current consensus. When the Moon is directly between the Sun and Earth, he continued, it could glide over the Sun’s face and thus obscure the latter (9). The book instructs children how to use a lamp placed in a dark room and a round object held in hand for a more experiential understanding of the phenomena (10-13). (Teachers are still using essentially the same experiment to help students visualize celestial movements, as can be seen in “Moon Phases Demonstration,” a video made by the National Science Teachers Association.)

The back of a movable diagram that illustrates three types of solar eclipses, in Eclipses Made Easy.

The most spectacular feature of the book is a movable diagram that illustrates the difference among three solar eclipses: total, annular, and partial. By turning a round-shaped card, fastened by a knotted thread to the back of a partially hollowed plate facing the title page, a young reader can see through a peep hole how the three eclipses differ.

The Cotsen copy is a rare one that has the volvelle intact and working. The Harvard University Library has a nicely digitized version of the same title online. Perhaps attesting to the popularity of the movable part, the revolving card in that copy is no longer extant.

Turning the movable disk to reveal different solar eclipses through a peep hole.

The movement of the diagram, interesting as it is, does not really reflect the relative movement of the Sun and the Moon. It can be disorientating, because the diagram presents eclipses as they are viewed from Earth, but it is juxtaposed with a picture of Earth globe viewed from space. Still, the design should receive credit for making astronomy fun and participatory.

Popular Astronomy in Transparent Charts: Gazing at a Sublime Starry Sky

Astronomie Populaire en Tableaux Transparents, or “Popular Astronomy in Transparent Charts,” contains 12 plates of lithographs on thick card, illustrating the solar system, solar phenomena, telescopic appearance of the Moon, the lunar phases, eclipses, the theory of the seasons, comets and aerolites, etc. Two publishers, one in Hall, Württemberg, Germany and the other in Brussels, Belgium, are jointly listed. The set appears to be a French translation of Astronomical Diagrams, published in London around 1851. Cotsen has collected both versions.

Astronomie Populaire en Tableaux Transparents. Hall, Württemberg: Librairie de W. Nitzschke; Bruxelles: Kiessling & Comp, [ca. 1856] (Cotsen 661)

Astronomical Diagrams. London: James Reynolds, [1851?] (Cotsen 28140)

I will focus on the French-language edition for a reason that will become transparent. Even though the two language editions seem to carry equivalent texts (distance was converted from miles in English to kilometers in French) and identical visuals, small details in manufacturing let the French version outshine the original English edition. For that same reason, you will want to hold the plates in your hand to fully appreciate the wonder of the design, because there are sensory experiences a digital surrogate is not yet capable of delivering through an electronic screen. (The third edition of the French version has been digitized by the Linda Hall Library in full and made freely accessible online.)

In half of the plates of Astronomie Populaire, the stars, the Sun, the Moon, and other planets are hollowed out or partially so, with colored tissue sheets mounted to the versos of the cards. When you hold up a plate like that against the light, you find yourself suddenly gazing at illuminated celestial bodies. Even the most saturated color splashed on solid paper cannot compete with the amazing glow, which changes intensity like real stars do, as you will no doubt be tempted to play with the position of the plates relative to the light source, trying to achieve the sublime view.

The hollowed star chart held against the light. Astronomie Populaire en Tableaux Transparents (Cotsen 661).

The back side of the star charts is mounted with translucent tissue paper.
Left: English edition, with white tissue paper; right: French edition, with yellow one.

The English edition employs the same design, but the newer, French version has improved its implementation in small details. The French star chart shines more brightly for three reasons. First, the tissue paper used in the French copy is more translucent than that glued to the English plates. Second, the bright yellow sheets used by the French one render vivid glows more easily than the white tissue paper found in the English copy. Lastly, the French copy took pains to punch slightly larger round holes through the stars, letting more light through. Mostly impressively, first magnitude stars received special treatment, with holes punched in the elegant shape of…stars.

Alert: there are two errors in this diagram. Astronomical Diagrams (Cotsen 28140).

Solar eclipse as illustrated in Astronomie Populaire en Tableaux Transparents (Cotsen 661).

For illustrations of eclipses, neither edition employs the design of a hollowed card backed by translucent paper. The English edition contains two errors. First, the Moon’s penumbra is not depicted in the diagram of a solar eclipse. Second, the line that demarcates the illuminated half of the Moon and its dark side should have cut straight across the circle that represents the Moon. It should not be curved. Both are corrected in the French version.

“Aerobic Astronomy” for Chinese Children

If the aforementioned books suggest that the study of astronomy involves endless reading, gazing, and mathematical calculation, then it is time to introduce what I call “aerobic astronomy,” befitting for an increased appreciation of multiple intelligences and diverse learning styles.

Solar and Lunar Eclipses 日食和月食, published in Shanghai in 1958, explains the titular topics to readers at the elementary school level. One of the book’s coauthors, Bian Depei (1926-2001), was a prolific Chinese writer of popular astronomy. A minor planet, 6742 Biandepei, is named after him, honoring the important role he played in establishing the Beijing Planetarium in 1954 and launching Amateur Astronomer magazine in 1958, both the first of their kind in China (Schmadel 532).

Solar and Lunar Eclipses 日食和月食 / written by Bian Depei and Xu Qingshan; illustrated by Jin Kairong, Si Ming, and others. Shanghai: Shao nian er tong chu ban she, 1958. (Cotsen 102528)

Bian introduced a physical exercise to help children visualize the occurrence of eclipses. Three children, each representing the Sun, the Moon, and Earth, are to demonstrate their revolutions. “The Sun” will stand still at the center of a big circle, along which “Earth” will move counterclockwise. Meanwhile, “the Moon” makes a smaller circle, also counterclockwise, around “Earth.” Whenever the three children form one straight line is an occasion for either a solar or a lunar eclipse. I think the game will be more fun and challenging if “the Sun” is also required to move.

What these titles share is palpable excitement about the wonder and beauty of astronomical phenomena, an excitement we relate to on the eve of the 2017 totality. Whether you plan to experience and celebrate the total eclipse visually, or musically, or kinesthetically, or gastrologically, we wish you a cloudless Monday wherever you are.

Ian Dooley and Miriam Jankiewicz contributed to this post.

Encounters with Illustration Processes, or “What Did You Do on Your Summer Vacation?”

Remember being asked the, “What did you do on your summer vacation?” question at the beginning of each new school year?  And usually being hard-pressed to come up with a “good” answer?  Here’s a possible answer for one grown-up in 2017… Imagine being in a postgraduate-level class held at a leading American university with fellow professionals, some of them tenured faculty members, and making pictures of various types… And liking it…  And learning a lot in the process…

Original wood-engraved block used to print upper wrapper of McLoughlin Brothers’ “Little Pet’s Picture Alphabet.” New York: McLoughlin Bros, [1875?]. (Cotsen 32858)

No, this is not the Cotsen Blog’s April Fool’s Day posting!  And the classwork was definitely not quite as simple as “making pictures” either.  But in a recent class on “Book Illustration Processes” at “Rare Book School,” a program held each summer at the University of Virginia’s main Charlottesville campus, not far from the Thomas Jefferson-designed “Lawn” and Academic Village, we did get to make wood-engravings, metal-cut engravings, and drypoints, as a complement to five days of 8:30 am to 5 pm classes, lectures, and presentations, and lots of scholarly reading.  (Definitely not a leisurely “vacation”!)  And in the process of putting reading into practice, we did  learn a lot about the differences between these illustration processes (and other processes) that were widely used in books for both children and grown-ups from the earliest days of printing into the mid-eighteenth century (when Thomas Bewick began executing wood-engravings) and on into the early twentieth century, when manual illustration processes became supplanted by process-printing and photo-mechanical work.

It’s one thing to read about how a burin (a sharp, chisel-like tool used in wood-engravings) leaves characteristically different traces on a wood-engraved block than those made by a metal engraving graver on a copper or steel plate (most which can usually be seen only under magnification).  It’s another to wield these tools with your hands and feel how differently an engraving tool interacts with the wood or metal medium as it glides relatively smoothly through a soft metal surface — the incised engraved lines which will provide the basis of the intaglio engraving — compared with the sort of jabbing motion made by a chisel-like burin as you try to scoop out bits of the non-printing area on a piece of hardwood.  (Full disclosure: we actually used linoleum blocks, rather than hardwood, in the interests of conservation and safety, and zinc plates rather than a copper ones, in the interests of economy (copper is expensive!), but the basic processes used are still the same in the respective media.)

Let’s take a look at the faux wood-engraving I made (with apologies for the lack of artistry or wood-engraving skills) and a trial printing of it.  As you can see, parts of the block were cut away (using the burin), leaving the outline of the elephant illustration on the original level of the block’s surface.  (A version of the illustration had been made on the block as a guide for us to follow — as is always the case in wood engraving — but the goal was for us to leave the lines more or less intact and carve away the rest; the idea being that the printed surface would then replicate the guide illustration.  Vestiges of these lines have been obscured by the printer’s ink now, though.)  When the block is inked, these chiseled-away away sections — recessed below the printing surface — remain uninked and so appear as white space in the actual print — and also on the block itself, as you can see.  Wood-engravings tend to accentuate black colors, as you can see in this crude example.  In the hands of a real master wood-engraver, like Thomas Bewick or the Dalziels, the effect can be highly dramatic!

“Wood-engraved” block (actually a lino-cut block) at right, and trial print made from it (at left): note the black-white contrast and the “mirror images.”

Do you notice anything fundamentally different about the block and the print-out made from it?  The print image is reversed.  This doesn’t really matter in an illustration like this, except perhaps for a more aesthetic effect one way or the other, but imagine if the block depicted an actual landscape scene, a building, or included some lettering!  The wood-engraver would have to work “in reverse” in order for the actual print to have an accurate orientation.  Even if a mirror, or reverse-view guide-image was used, imagine how much harder this would make the cutting!  Hands-on work like this project really brought home the skill of the wood-cutters to all of us in the class — and also the sheer level of physical effort needed to engrave the block — and not obliterate the image by chiseling out too large a gouge (my elephant almost lost an eye that way, as you can perhaps see if you look closely).

Two printings from of the same block: one the whole block (on left) and the other with the background masked out by a paper frisket (on right).

Take a look at the two prints above and see if you can spot the difference and figure out how that was done… The print on the left displays the entire block’s illustration — the elephant and the quasi-decorative border.  For the print on the right, I used a paper “frisket” to effectively mask off the background (it’s not perfectly done, as you can see on the right edge, but I hope you get the basic idea).  The frisket here was just a piece of paper cut to mask off the area outside the illustration outline, or any area you don’t want to print — Photoshop-style techniques done manually!   In a case like this, we might want to hide the border to make the illustration fit more harmoniously on a page with letter-press text above and below — or for the sort of small vignettes often seen on title pages or as head- or tail-pieces in wood-engraved books in the hand-press era.

A frisket could also be used to facilitate the printing of two-color illustrations (usually red and black), by first masking off the area to be printed in red, and then masking off the area already printed in black with another frisket when red was printed.  This allowed the page to be printed without unlocking the printing form or the whole illustration by just re-inking the added red color– a significant saving in time, effort, and money at the time.  The same basic approach was also used for red and black text on the same page, in many cases.

As so often happens, once you learn about something in one context, you seem to happen upon another related instance soon afterward.  Just days after returning to work at Cotsen Library after Rare Book School, we were looking at a wood-engraved block from the mid-nineteenth-century, used by McLouglin Brothers — the renowned New York publisher of children’s books, games, paper dolls, and paper-based toys of all sorts from the mid-nineteenth century- into the early twentieth century — to print the upper paper wrapper of their children’s publication, Little Pet’s Picture Alphabet, especially unusual since the block is housed with a copy of the actual toy-book-like publication now (Cotsen 32858).

Wood-engraved block (from McLoughlin Brothers’ publisher’s archives) and an example of one of the two-color paper wrappers printed from it (Cotsen 32858)

You can see the “mirror image” relation between the block itself and the printed version again. I think that the essentially outline line-illustration and black half-circle backdrop around the children was printed upon red paper (or paper printed red), but I’m not certain.  The black area has the kind of “textured” irregularity usually found in solid black areas of wood-engravings or wood blocks; pure black was hard to to print smoothly via a woodblock, made from organic, naturally textured wood (in contrast to the smooth surface of an unworked metal plate used for intaglio printing).

Side view of the composite wood-engraved block, highlighting the lines between the separate individual blocks.

You can also see the lines between different pieces of the composite wood-engraved block — it looks like seven separate blocks to me.  This enabled several engravers to render an illustrator’s artwork on different blocks at the same time — time was money in printing then, as now.  It’s also possible that separate interlocking blocks were somehow easier for McLoughlin to store and manage, and perhaps also to re-purpose individual blocks for other illustrations, as the firm often did.  (For large illustrations, of course several — sometimes, many — wood-engraved blocks would have to be used; how many trees do you see with smooth straight 11″ x 17″ — or larger — sections from which a smoothed block that size could have been made?  Large planks were in high demand in the hand-press era for things like ship-building for the navy and trade vessels too.)  And for wood-engraving blocks, which run across the grain, we’re looking for trees with that size as a usable circumference, not counting the bark, outer ring, and core.

This particular composite block was presumably originally comprised of six separate pieces — the seventh small one (on the left side) must have been a correction of a mistake, an unsatisfactorily-rendered detail, or a “quick fix” for a block damaged in printing, handling, or storage.  If you look closely, you can also see what looks like a crack in the upper center block, running into the smaller child’s head, reinforcing the idea that the block was damaged after being rendered, not due to an error during the original wood-engraving.  (Wood blocks can be repaired, or have small pieces added like this, while correcting pieces of missing or badly-damaged metal plates can be all but impossible.)

There’s a trace of the small block’s line in the black background area, but it doesn’t seem visible in the child’s face.  Either the touch-up was very good, or this further damage occurred some time after the wood-engraving was used to print the accompanying book that now accompanies it.  If damage to hand-rendered printing resources seems careless to you, remember that McLoughlin had literally thousands of these blocks to store and keep track of, and that they were often reused for later printing.  Proof-copies of many of the blocks were printed on sheets in large tome-like scrapbooks in the firm’s publisher’s archive — document and object management before the digital era!  (Cotsen has ten of these unique, publisher’s archives scrapbooks in its collection, which we hope to digitize in order to provide better access.)

Metal engraved plate: Note the residue of black ink in the grooves and incised lines made by a graver; these printed out as black lines in trial prints, with the unworked “surface” part of the plate not printing.

I may have been using the term “wood engraving” without really defining it or distinguishing it from “woodcut.”  What’s the difference?  Both wood-engraving and woodcuts are “relief processes” — that is, both print the surface area of a block, leaving the area unprinted (and usually white) where the wood has been cut away by a knife or burin. Woodcuts, the earlier-devised process, use smoothed blocks cut lengthwise along the grain like a plank, often softer wood that can be cut relatively easily with a sharp knives or similar cutting tools.  Wood engravings use blocks of hard wood (frequently boxwood) cut across the grain, using burins to chisel into the harder wood.  Wood engravings are generally more durable than woodcuts, as you’d expect, and can pick up a lot of contrast-adding texture from the inherent grain of the wood, at least when done by a master like Bewick. (By the way, the Tempest connection was based on an woodcut I seem to recall seeing some time ago in a fairly early edition of the play, with a similar scene, but the ship on the tempest-tossed sea.  “Full fathoms five” is part of Ariel’s song to the shipwrecked crew.)

As relief processes, both woodcuts and wood engravings are distinct from “intaglio”  processes, such as copper and steel engraving — or etching, mezzotint, or aquatint, for that matter (which use acid and chemicals instead of tools to render the illustrations), but we won’t get that far today.  (And, yes, the reuse of the term “engraving” for both relief wood engravings and intaglio metal engraving is confusing!)

In intaglio processes, the lines cut into the plate by the engraving tools are where the ink gathers during the printing process — these lines print black (in contrast to relief processes, where the incised, or cut away, sections remain unpainted). Tremendous pressure is needed to actually squeeze the dampened paper slightly into the grooves, where the paper picks up the inked impression. A roller-press is usually needed to achieve this level of pressure on a relatively think metal plate, and that’s what we used at Rare Book School to make our proof prints. (“Hands on” experience, to be sure!)

However our sub-journeyman engraver here (i.e. me) forgot a basic fact of printing when adding the text, didn’t he?  Take a look below!  The image prints in reverse of the plate!  So his “JB” monogram initials and and his brief quote, from the Tempest, are also printed in reverse.  Oops!  What to do?  Scratch out the text and try to doctor the plate somehow?  Weep in frustration?

Engraved metal plate (right), with inked outlines visible in the grooves, and a proof printing (left), which reverses the plate’s orientation of both illustration and text — making the latter illegible. Back to the drawing board!

Mercifully, the course instructor and Grand Maester of Printing Processes, Terry Belanger, immediately had a solution — a “counterproof” print. We removed the plate and used-the newly-inked print (whose ink was still damp) to print another version of the illustration — in reverse of the print– on a new sheet of paper, which resulted in a correctly douple-reversed orientation of the engraved text.

“Original” print (right) and counterproofed, second version , reversing the illustration and text a second time — now the text is legible!

As you can see in the “print-counterproof” print comparison above, the counterproof reversed the engraved test’s orientation a second time, so now it’s legible.  This served the bill perfectly here, although it would probably not have been a viable tactic in a commercial printing establishment, even one with a limited printing run of 500-1000 copies. (And the sub-apprentice engraver avoided having his ears boxed by his master for executing poorly thought-out work!)  Not surprisingly, the counterproof printing is lighter than the first version, since it relied on wet ink from the print proof, and some of the toning from ink on the surface of the plate (visible below the sun in the first proof) is similarly missing.  But disaster was averted!  And the lesson also indubitably imprinted in my mind too.

The “reverse” aspect of letterpress type and relief and intaglio printing (like almost all illustration processes) is one of the aspects we always stress for students or others to whom we present rare printed books.  Imagine setting all the type, using thousands of individual pieces of individual metal type letters, set in reverse, and also set from the end of the lines to the beginning, in the First Folio or Gutenberg Bible!  And don’t forget about spacing or justifying type in the center of a page or column; this required flat (non-printing) metal spacers, a good eye, and sometimes adjustment of the spacers after an initial proof print was made. (Of course, large books requiring as much type and paper as the First Folio, were generally not all set in type at the same time — few, if any, printers had that much type on hand to use, even with borrowed type or in syndicated print jobs, nor could they afford to tie it all up in a single time-consuming book project like the First Folio; printers needed some type readily available for job printing, handbills, and broadsides in order to keep paying their bills!

“Drypoint” is another intaglio process we looked at closely in “Book Illustration Processes” and one at which we also tried our hands. In drypoint, a steel needle replaces the rougher  engraver’s tool and allows an illustrator to draw directly on a metal plate, with something vaguely like the experience of drawing on paper. Unlike graver or burin, which scoop the shaved metal bits out of the incised lines, the thin needle throws up a “burr” on both sides; sometimes this burr is removed and sometimes left intact “adding richness of line to the design when printed” (John Harthan: History of the Illustrated Book, p. 282).

For class purposes, we used thin, clear acrylic sheets for our drypoints — softer and easier to work than metal, easier to proof in a preliminary way, using very lightly inked paper run across the engraved surface to reveal details (or lack thereof!), and most important of all, the clear sheets allowed us to place a printed master image to copy right underneath the acrylic sheet and essentially use the needle to “trace” lines on the sheet — or attempt to.  A real illustrator wouldn’t need such a guide to follow and would probably also prefer the flexibility of drawing freely, which is one of process’s main points of attraction to artists.  No need for a “mediating” engraver with a drypoint.

Drypoint intalglio as executed on clear acrylic sheet (right), with proof print (left). Note the visible outline of the plate-mark on the print. Plate-marks are one of the tell-tale signs of intaglio illustration processes — if you’re lucky! Sometimes, they can be faint or virtually invisible.

But what’s “wrong” with the picture above?  Remember the reverse image of the engraved metal plate and wood engraved illustration?  Why should drypoint be any different?  Well, it isn’t!  Since the acrylic sheet is transparent, I was able to photograph it “upside down” with the incised lines underneath, in the interests of facilitating comparison between the incised sheet and the print.  (The unmarked surface of the underside of the sheet also just seemed to photograph better too — something to do with quick-and-dirty digital photography, though, not the illustration process itself!)

I hope I’ve shared some of what I learned about illustration processes with you, and in a way that clarifies what can be murky abstract concepts with differences that can also be hard to explain without showing actual examples — good, bad, or indifferent in artistic terms.  Wood-engraving, intaglio metal cuts using both copper and steel plates, and drypoints were all important illustration processes in children’s books from the early- to mid-eighteenth century through the early twentieth century.  There were other processes too, such as mezzotints and aquatints, but all of these were non-colored processes, except where hand-coloring or stencil-coloring was used.

For color illustrations, we have to look at color-tinted wood blocks or wood-engravings, color lithography, chromolithography, chromoxylography (colored wood-engravings), and color processes like the Baxter and Nelson Processes.  And this leaves out process-printing, photolithographic processes, and others besides.  I hope to cover that in a later posting here on the Cotsen blog.  For now, perhaps I should put my “artistic” endeavors in illustration processes up on the mantle-piece with some woodblocks, color lino blocks, and prints of these that my daughter made a number of years ago, and see which ones people like more?  I have a bad feeling about that contest, though…