Relief of Complex Gamma Fcn — was this hand drawn?

[benorin]

This pic is from an older text called Tables of Higher Functions (interestingly both in German first then English second) that I jumped at buying from some niche bookstore for $40. Was this hand drawn? I think I’ve seen was it that mathegraphix or something like that linked by @fresh_42 somewhere on PF that had an example plot similar to these.

 

[jedishrfu]

I guess it depends on when the book was published, but my guess is it was hand drawn by an artist versed in math or at the direction of a mathematician. Or a draftsman drew it getting the perspective accurate.

As an example of the quality of hand-drawn charts here's Charles Minard's famous Napoleon chart:

https://datavizblog.files.wordpress.com/2013/05/map-full-size1.png

But I could be wrong about it too.