Abstract
A CIRCULAR recently issued by the United States Bureau of Standards* furnishes information concerning the verification of standards of mass and the most suitable forms of such standards for different purposes. An account is first given of the fundamental and national standards of mass of the United States. The standard is the kilogram, from which the pound is derived by the relation i Ib. avoirdupois =0.4535924277 kilogram, a relation which shows that the avoirdupois pound of the United States is the same as the British pound. The distinction between mass and weight is then considered, and it is explained that weight.is measured in units of force, and that, as it is not feasible for the purposes of metrology to base the unit of force on some concrete standard force, the unit is derived from the established units of mass and acceleration.
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Standard of Mass . Nature 103, 515 (1919). https://doi.org/10.1038/103515a0
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DOI: https://doi.org/10.1038/103515a0