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Before the advent of digital computers, a lot of scientific publications had high quality illustrations. How did they do this without computers?

EDIT

Examples of illustrations to which I am referring:

enter image description here

enter image description here

(from Timoshenko, S. (1940). Strength of materials. Part I & II.)

EDIT 2

I am asking how illustrations was drawn in first place (by an artist), not how them was transferred to book paper (by a printer).

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How did they do this without computers?

They used rulers. If you exclusively know how to draw with a computer: that's a straight edged object, to help guide a pen or pencil into a straight line.

For really advanced technical drawings, such as the curve graph example, there were templates with different curves (elliptic, parabolic, hyperbolic):

these are not ice skates

There were even templates for the distinct type of lettering (to draw by hand). There were also rub-off sheets, for lettering as well as for standard symbols:

a music symbol template
(image from http://www.smithdrafting.com; see there for loads more of these)

(Although it appears to me no template was used in your examples, as they both are lettered good but not perfectly.)

The hand drawn images can be cut and pasted onto text pages to fit, after which the entire page was photographed and used as-is, or, alternatively, the images could be photographed separately from the text and composited as negatives, just prior to transferring them to an offset plate. The latter was the preferred way of handling these where I started out, because often the quality of the images was wildly different from the plain (typeset) text. That way we could ensure an optimal contrast for both images and text.

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    They might have also used a spline (one of those non-digital ones ;) Ive actually done the same as the boeing guy). – joojaa Oct 18 '15 at 16:27
  • @joojaa: ooh that looks pretty hard core. I was only on the receiving end of those illustrations, but one of my brothers went to technical school and had lots of pre-formed curvy rulers for his drawing class. – Jongware Oct 18 '15 at 16:30
  • Beethoven didn't like this – Ooker Oct 19 '15 at 4:32
  • This answer makes me feel ooooooooold. At 34, when I was in High School, we had a mechanical drawing class, and Mechanical Drawing II was CAD. We had to learn how to use these types of drawing apparatus BEFORE advancing to CAD. Those curves were tricky to master but once you managed to get the hang of them, and practiced, even someone of poor freehand drawing capability could do pretty well with engineering design. – RLH Oct 19 '15 at 14:55
  • whoa..."rulers", you say. Were these the Rulers of the Netherworld? Or some lesser beings? And what are those curvy plastic pieces that you are showing in your imagery? – coderworks Oct 20 '15 at 5:45
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Engineers and scientists of different branches used to have drawing classes on their curriculum. Many of these people were quite accomplished at this.

We used to have row upon row of drawing boards in the classrooms in the design/engineering departments. The drawings were drawn with pencil and then inked for final results. They would then be reproduced on a etching on a pressing plate. Techniques were varies and include he photogravure, chromolithography, basically the image was photographed and then using projected with a light onto a light sensitive substrate that then protected the plate. Similar tech is used today for producing electrical circuits.

It still bothers me that many of these hand drawn images are actually better than what many produce today. Publishing decent quality images is easier today than ever in the past yet people can't use even that.

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    @user3368561 They would draw them by hand, then they would use a machine that's to all intents and purposes a camera and transfer the image to film. They would then use this film and a light projector to produce the plates via lithography for example. Back then cut and paste really meant cut and paste. – joojaa Oct 18 '15 at 13:43
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    @jooja: yup - photographing and then cutting an pasting negatives was what I started with "back then". Oh wait, that was 30 years ago so no quotes needed 😳 (The next step was transferring those negatives to aluminium offset plates, using a blast of UV to bake the images in.) – Jongware Oct 18 '15 at 16:01
  • +1 For hand-drawn images often being better than most produced today. Many people seem to be constrained by the limits of the software (or by the burden of learning how to make advanced use of it). E.g. recently encountered example – RedGrittyBrick Oct 19 '15 at 10:33
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A lot of the old engineering books have a chapter on drawing - for example, I have "A textbook on Electric Lighting and railways" International Correspondence Schools, Scranton, PA, 1901; the first 100 pages or more are about technical drawing. We had to learn technical drawing in school (1970s UK).

One practical way to draw the lines on the graph is to mark as many points as possible in pencil and then fit a flexible French Curve to the points and use a ruling pen to draw along it; with practice you can also draw the lines freehand once you pencil it in lightly first, or use the edge of a brass (or, more recently, plastic) set of French Curves, as others have suggested.

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  • The ice skates are actually called "French Curves"? – Jongware Oct 19 '15 at 20:16
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The basic tools were, for students and small shops, drawing board, T-square, triangles (30-60-90 and 45-45-90 and sometimes adjustable-angle ones), pencils (non-repro blue was favorite since it didn't have to be erased, but black was used too), compass sets (center-wheel K&Es (Keuffel & Esser) and Dietzgens were probably favorite) and Rapidograph technical pens for lining around curves because the ruling pens in the compass sets didn't really want to go around curves and would blob. Erasers were important, both ruby for ink and kneaded for pencil. Most finished work was done in waterproof india ink.

Bigger shops used "drafting machines" (you can find them on ebay still) in place of the board, t-square, and triangles, but also the compass sets, pencils, Rapidographs, and erasers.

Depending on the industry, one might have a set of french curves and/or a spline / ship's curve set. Splines were more general because they could be shaped, but trickier to use because they could be re-shaped accidentally.

There were (still are, I suppose) standards for the types of crosshatching to indicate material, the angles and distances at which dimensions and legends were added, etc. The standards varied by industry.

Calculation was usually done with a slide rule.

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    Plus one for remembering to bring your T-square. – Mazura Oct 19 '15 at 23:18
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Such artwork was generally referred to as "technical drawing" and was very much a part of the syllabus for all qualified "technicians" (ie. those attending formal training colleges) and also many graduate engineers.

If you just search for terms related to "manual technical drawing" and "manual draughting" you will find lots of stuff on the subject. Or start with these and then follow the links :

Wikipedia: "technical drawing", "technical drawing tool"

YouTube: "technical drawing", "french curve", etc

And some people do still do it the hard way: https://www.youtube.com/watch?v=l-R8uKC_224

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  • I know technical drawing, I learned it too. I am just asking if those illustrations was drawn by other means than by hand. – user3368561 Oct 19 '15 at 12:03
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Ho-ho, the book is dated 1940!

Now look, back in those days and up to when computers started appearing "technical drawing" used to be an obligatory subject at high school (well, at least down here in Russia). They would teach you just how to handle those weird devices mentioned above, if you're up to becoming an engineer.

1) Things used to be drawn using a simple "ruling pen" (google it up) filled with ink.

2) In the 2nd part of the XXth century "rapidograph" appeared and made it a bit easier -- as much as rechargeable ink pen is better than the "dipping" one. Though precision is better with the ol ruling pen...

3) Linking "seamlessly" the ends of two curves drawn using those curve "rules" shown above was proof of your drawing skill. Now in the college of architecture one of the entering exams was technical drawing. The most tricky par was meeting ends of curves, those were checked with a magnifier by a teacher...

Back in the 80-s things were still drawn by hand -- at least student tasks. Most troublesome was "typing" the text in decently looking letters with a pen... You can see it on your illustrations, letters are hand-written.

As for books, I guess the author did the drawings himself. Back then a good engineer/specialist knew how to draw, that was part of the expertise.

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If you question is how they reproduced diagrams ad such in printed books: Engravings ("cuts"), originally prepared by hand and later via a photoresist etching process.

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They hired illustrators to draw high quality illustrations using analog media such as markers and paint.

UPDATE:

Now that I see your examples, those are hand drawn mechanical engineering drawings. The technique is pencils, paper, straight edges, and mechanical measuring tools (rules, compasses, protractors, etc.)

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    There has always been editors and illustrators, I know. I am asking for techniques they used. – user3368561 Oct 18 '15 at 13:42
  • @user3368561 your examples help a lot. Of course, they now invalidate my answer. :) – DA01 Oct 19 '15 at 5:29
  • You could always delete it, DA. :) – Vincent Oct 19 '15 at 13:13

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