Imperial standards : report on the comparisons of the parliamentary copies of the imperial standards deposited at the Royal Mint, with the Royal Society, at the Standard Weights and Measures Department of the Board of Trade, and formerly in the Royal Observatory, Greenwich, but now in the Royal Observatory, Herstmonceux, with each other during the year 1957.
Great Britain.Board of Trade,issuing body.
Great Britain.His Majesty's Stationery Office.