Shutter for observing Aurora, H.O.5, on brass foot

Made:
1870-1890

Shutter for observing Aurora, H.O.5, on brass foot 4" diam. sliding pillar, wedge about 6 1/2" long, 3/4" wide, rack and pinion adjustment, scale in inches and 1/10 nod 0 to 65, vernier (unusual kind) and wooden case. Wooden velvet covered cap for eye end, brass view tube 8 1/2" long with sliding tube, extra brass end for glass

Details

Category:
Astronomy
Object Number:
1911-237
Materials:
brass, glass
type:
diaphragms
credit:
British Admiralty (Hydrographic Department)

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