Antique Original hotsell Photographic Glass Slide, Men in An Early Laboratory, Scientists At Work, Historic Image, German?

One of a group of antique glass slides found in the attic of an old house, this fascinating image dates from the late 19th century and shows 2 men amongst scientific equipment in a laboratory. Entitled "Uberreicht durch Frits Kohler" . There are also 2 signatures beneath the men. While the image is interesting in itself, those with a knowledge of scientific history may well discover hotsell this to be an item of historic importance. Condition is very good.