Report by the Board of Trade on the comparisons of the parliamentary copies of the imperial standards deposited at the Royal Mint, with the Royal Society, in the Royal Observatory, Greenwich, in the Royal Palace of Westminster, and at the Standards Department of the Board of Trade with the imperial standard yard and the imperial standard pound and with each other together with a report on the re-verification of the British national copies of the metre and kilogramme and an account of a re-determination of the ratio of the pound to the kilogramme made during the years 1922 to 1927 [electronic resource].