8 miscellaneous aperture stops
Date: 1875-1900
Inventory Number: 2007-1-0357
Classification: Diaphragm
Dimensions:widest disk: 4.3 × 4.3 × 0.6 cm (1 11/16 × 1 11/16 × 1/4 in.)
tallest tube: 2.5 × 2.3 × 2.3 cm (1 × 7/8 × 7/8 in.)
Description:
This is an assortment of 8 miscellaneous aperture stops. All are made of brass and all but two are threaded so that they may be screwed onto a lens (e.g., a telescope objective), eyepiece, or similar optical instrument.