Joly block photometer, an optical demonstration instrument, unsigned, British, 1884-1946. Consists of two plocks of opal in wooden mount.
Details
- Category:
- Optics
- Object Number:
- 1946-317
- Materials:
- opal, metal (unknown) and wood
- Measurements:
-
overall: 76 mm x 82 mm x 55 mm, .094kg
- type:
- joly photometer
- credit:
- Trotter, A.P.
