Filar micrometer

The micrometer goes with 6 eyepiece lenses for various magnifications. Fixed on a telescope it is used to measure angular distances.
L. Casella provided astronomical instruments to the British Navy during the second half of the 19th c.

Data
Inventory Number: 
AST05
Date: 
1860 (c.)
Dimensions: 
Length : 24cm, Width : 18cm, Height : 5cm
Maker: 
Instrument Categories: 
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