11. Small Reflex Camera Obscura, c. 1710


Similar in date to the previous instrument, but in this case the image is cast by the lens onto the inclined mirror and then reflected onto the ground glass screen (missing) which was fitted in the trapdoor in the top of the box. The lens tube of this camera obscura may be a shortened telescope tube.

Length: 188 mm.
Inventory no. 75,945.