Shutter for observing Aurora

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 and glass
type:
ancillary instruments and diaphragms
credit:
British Admiralty (Hydrographic Department)

Parts

Shutter for observing Aurora

Shutter for observing Aurora

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). Wooden velvet covered cap for eye end, brass view tube 8 1/2" long with sliding tube, extra brass end for glass

Materials:
glass and brass (copper, zinc alloy)
Object Number:
1911-237 Pt2
type:
components and diaphragms