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Standard Length - Yard, Troughton & Simms, Primary Standard, Victoria, 1855 Object Reg. No: ST 042514

Summary:
Standard yard made by Troughton & Simms, London, 1855. Parliamentary copy No. 34 of the British standard yard of 1854. Bronze bar in wooden case. The yard is measured between fine lines marked on a gold pin in the well at each end of the bar.

Primary standard yard for Victoria, 1856 to 1966. This standard yard was placed in the custody of Robert Ellery, Government Astronomer, in 1860.

1 yard is approximately 91cm.
Statement Of Significance:
From its inception the Melbourne Observatory had sets of standard weights and measures, which had been tested in Britain against the Imperial standards. These included the primary standard yard and pound for the Colony of Victoria. Other standards of weight and measure in the colony could be compared to these primary standards.

The British Imperial Standards were introduced in 1824, to systematise the varying standards that had been used previously. Unfortunately these standards were destroyed when the British Houses of Parliament burned down in 1834, and new standards had to be established.

Research was undertaken over a ten-year period to choose the best metal for the standard yard, testing the bars carefully at different temperatures to establish its expansion rate. In ten years over 200,000 measurements were made deep in a cellar of the Royal Astronomical Society's building in London, using microscopes to observe the slightest changes in length.

The best bar was nominated the Imperial Standard Yard, and the next best bars were approved as Parliamentary Copies and sent to major cities in the United Kingdom and British colonies. The Victorian standard is Parliamentary Copy No 34 of the British Standard Yard of 1854. It is made from a metal developed by British Astronomer Francis Baily, made up of 16 parts copper, 2½ parts tin and 1 part zinc.

This standard yard was kept with other standard measures in the basement at Melbourne Observatory, to reduce the effects of changes in temperature. Even so special calculations had to be made to allow for the expansion and contraction of the metal in the standard yard. The standard yard was set up in a machine fitted with microscopes, so that exact comparisons could be made of two measures.
Acquisition Information:
Transfer from Victoria: Local Government Department Office of Trade Measurement (formerly Weights & Measures Branch), 1994
Discipline: Technology
Dimensions: 10 cm (Height), 8 cm (Width), 113 cm (Length)

More information

Tagged with: standard weights measures
Themes this item is part of: Weights & Measures at Melbourne Observatory, Troughton & Simms, Instrument Makers, Melbourne Observatory Collection, Science & Measurement Collection, Working Life & Trades Collection, Positional Astronomy at Melbourne Observatory, Melbourne Observatory & Standard Time in Victoria, Astrographic Catalogue, Transits of Venus, 1874 & 1882, Buildings at Melbourne Observatory, Star Observations & Personal Equation, Meteorology at Melbourne Observatory, 1863-1908, Melbourne Observatory, 1863-1944, Geodetic Survey of Victoria, 1858-1872
Primary Classification: COMMERCE & RETAILING
Secondary Classification: Weights & Measures
Tertiary Classification: standard length
Inscriptions: Metal bar marked "COPPER 16 OZ, TIN 2 1/2, ZINC 1. MR BAILY'S METAL NO. 40. STANDARD YARD AT 61.99 FAHT. EXPERIMENTAL BAR A. TROUGHTON & SIMMS, LONDON"
Wooden case carved "BRITISH STANDARDS OF LENGTH & WEIGHT, NO. 34".
Maker: Troughton & Simms, London, Middlesex, England, Great Britain, 1855
User: Melbourne Observatory, South Yarra, Victoria, Australia, 1861-1944
User: Victoria: Weights & Measures Branch, South Yarra, Victoria, Australia, 1944-1966

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