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Bronze one inch standard

Pre-1824

Wood standard with tapered end

Determination of the kilogram standard, 1799

1799

Standard condenser type 515-A

1943

Brass standard 4 feet, in mahogany case

1826
The Commercial bronze standard of Imperial and Metric length, known as "CS", with its Comparing apparatus. Made by Troughton and Simms in 1869

bronze standard of Imperial and Metric length

1869
Marconi frequency standard type RD 101B, c. 1963

Marconi frequency standard type RD 101B, c. 1963

1963
20 foot standard by Ramsden, 1784

20 foot standard by Ramsden, 1784

1784
10 foot standard (Cape of Good Hope Survey), 1840

10 foot standard (Cape of Good Hope Survey), 1840

1840
10 foot standard (Survey of India), c. 1830

10 foot standard (Survey of India), c. 1830

1830
5 ft. tubular glass line standard of 1842, prepared by Bryan Donkin, F.R.S., in wooden case. Stds. Dept. No.455

5 ft. tubular glass line standard of 1842

1842
Parliamentary 5ft Standard, brass, by "Troughton" 1796, in mahogany box. Bar 5ftx1 7/16" x7/16". Divided in inches and tenths and figured from 0 to 60, at division 46:- 17" 58. Engraved Troughton London 1796. "Parliamentary Standard" various divisions on back "Exch" standard of Hen VII. 1490, "Exch" standard Eliz 1588, "Yard" "Ell"

Parliamentary 5ft Standard

1796