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William Roy’s standard scale, 1742

William Roy’s standard scale, 1742

1742

Tubular 5-foot standard scale by Troughton and Simms

Tubular 5-foot standard scale by Troughton and Simms

1833

Automatic scale no.501

Automatic scale no.501

1924

Birds scale, 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

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

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

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