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Customary units and standards of length
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ACCEPTED FOR TEST accuracy desired accurate adjustment of observations alloy apparatus available Bar Stand bench standard bulb BUREAU OF STANDARDS Bureau of Weights calibration certificate change in length changes of temperature CIRCULAR coefficient of expansion comparison constant temperature correct customary units decimeter definite determination difference distance edges entire length equation error Fahrenheit fee is charged feet graduations intercomparison international prototype meter iridium least squares left microscope length comparator length measurements Length of meter length standard line standards manufacturers marked measurements of length meter bars methods micrometer microscopes micrometer reading millimeters national prototype meter necessary nickel nontarnishing metal obtained physical constants plane platinum platinum-iridium position precise standards primary standard ruled surface scales sleeves special fee Spring balances STANDARDS OF LENGTH steel tapes subdivisions subintervals sufficient suitable supported throughout surface tempera tension handles test desired thermom thermometer tion total length transverse true coefficient ture United States bench weights and measures