Fait partie de Bass Stereoscopic Photography Collection
This item is an optical drawing device. It was designed to trace images appearing in the reflection of the mirrors. There are two slots on either part of the device to hold templates. The mirror swings back and forth beneath the stand to ensure a better view of the templates. Item comes with original manual titled "When And How To Use The Cheiroscope In Visual Training By Dr. Lee H. Jalonack O.D.F.D.S.F"