solar attachment for theodolite
Date: 1940-1960
Inventory Number: 2003-1-0139
Classification: Theodolite
Dimensions:attatchment: 12 × 22 × 8 cm (4 3/4 × 8 11/16 × 3 1/8 in.)
case: 13 × 17.5 × 6.5 cm (5 1/8 × 6 7/8 × 2 9/16 in.)
Accessories: carrying case
Description:
Instrument used to determine the solar altitude in surveying. It consists of an optical tube to the end of which is a pivoting rectangular mirror. The angle of this mirror is adjusted by a micrometric screw for precision measurements. The angle is found on a graduated scale (30°-0-30°) with vernier. The optical tube rotates on itself and can be inclined using also a micrometric screw for precision measurements. The angle of inclination is found on a graduated scale (0-80°) with vernier. The eyepiece has two pivoting filters attached together. There are three holes on the side for mounting purposes.
The leather case is not original to the instrument. It is probably a U.S. Army leather case.