This wonderful sketch of "teeth painlessly extracted by steam power" appears on an envelope addressed to a certain Dr J. Chapman of Totton, Southampton. As to whether he is the creator of the drawing also (or indeed someone in his household), the jury is out -- though the idea that the envelope made its way through the Victorian postal system so adorned is rather a nice thought.
There seem to be arguments either way. Looking closely one can see that the ink from the drawing overlays the stamp in the left hand corner, which would imply it made its way onto the envelope after postage (if the late 19th-century mailing process was anything like today's), though mysteriously also part of the address (the "D" of Dr) appears to overlay the stamp. All quite confusing.
Also, are there unnatural gaps between the "m" and "a" of "Chapman", and between the "c" and "o" of "Beaconsfield", where the pulley runs, and so implying the address was written around the drawing? Also, is the drawing signed "C. E. H." to the bottom left?
If so, does that imply someone other than Chapman? Someone else in his house-hold? The sender of the letter? "Chapman's Envelope Handiwork"? ~ Public Domain Review
Title: A scientist using a steam machine with pulley to extract a tooth from a man.
Artist: Pen drawing by C.E.H.
Date: 1894
Wellcome Library: no. 16761i