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Automatic scale no.501

1924
Tubular 5-foot standard scale by Troughton and Simms, with stand and wooden case (RAS No.13 & 95). Purchased by the Royal Astronomical Society in 1833.

Tubular 5-foot standard scale by Troughton and Simms

1833
Bird's brass standard scale, made about the year 1750, engraved "Royal Society 42", 92 7/ 16"x17/32"x9/32". Divided in inches and tenths from -1 to 90, from 10 to -0.1, a scale is divided in 100 parts. Rest on mahogany bed with cover the whole in wood case

Bird's brass standard scale

1750
Prototype in bronze of Russian Imperial standard archive measure with wooden case. (Presented to Stds. Dept. by Imp. Russian Govt. 1862)

Prototype in bronze of Russian Imperial standard archive measure with wooden case

1860-1862
Birds scale, in mahogany case, engraved J. Bird, London. 27" long, divided in inches and tenths, reads by vernier to 1/1000 in, scale numbered to read from 25 to 50. Fine adjustment to slide.

Birds scale

1745-1776