4.1-inch flat heliostat mirror
Date: mid 20th Century
Inventory Number: 1998-1-1368
Classification: Mirror
Dimensions:12.8 × 12.7 × 9 cm (5 1/16 × 5 × 3 9/16 in.)
Description:
This is a very fine flat mirror with front-surface silvering on glass. The mirror is held by three aluminum brackets in a cast aluminum. The cell has a three-armed spring-loaded mounting for fine adjustment of the mirror. This mounting is enclosed ina a brass sleeve, which has two circular handles. The latter are less oxidized and have screw holes for securing the mirror to its instrument.