focuser on a bracket
Date: 1850-1875
Inventory Number: 2007-1-0368
Classification: Optical Accessory
Dimensions:11.8 × 9 × 4.6 cm (4 5/8 × 3 9/16 × 1 13/16 in.)
Description:
Nickel-plated brass focusing tube (without optical components) has knurled edges. The focuser is attached to a ring mount with an arm. A spring-loaded screw holds a rod in the arm. A large knurled screw is mounted on the end of the rod.
A brass sleeve is on the focusing tube.