Source of Turing-machine illustration I am writing a computer science textbook and want to use an illustration showing a Turing machine.  Images are all over web, but almost always without authorship/illustratorship credited. I need to attribute authorship (and perhaps also clear rights).
Does anybody know where the image reproduced below first appeared?
Alternative: Can anybody point me to a similar illustration of a Turing machine where authorship is known?
The figure appears to come from the paper "Games, Logic, and Computers" by Hao Wang, which appeared in Scientific American, Volume 213, Number 5, November 1965, pages 98-106.  There is a copy online here:

http://www.cs.virginia.edu/cs200/readings/wang.pdf

In case you're wondering how I found it, I googled 'Turing machine "memory dial"'.  None of my Turing machines have a memory dial, so I was hoping to learn where to buy one.