1942 Carl Lange Stereoscopic Opthomological "Coordinator" Slides - Set 3 lock shaped key holder Theochrom and printed in Germany

Theochrom and printed in Germany

with a super textural

with the final marble ending up in the centre hole

but the wood has been hollowed out and whittled

1942 Carl Lange Stereoscopic Opthomological "Coordinator" Slides - Set 3 lock shaped key holder Theochrom and printed in GermanyI was pretty excited to find a box full of these handmade slides at the flea market this weekend a box in which many were rolled up in newspaper from 1945, seemingly untouched since then! What I've learned is that Carl W. Lange Sr. and Jr. , who copyrighted this set of stereoscopic slides in 1942, were father and son opthomologists with a practice near St. Louis and a particular commitment to curing myopia (nearsightedness.) They wrote and travelled