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accuracy air-pump tests analysis aneroid apparatus bolometers building Bureau of Standards calibration calorimetric carried ceramic chemical chemists Circular clays color concrete constructed cooperation determination devised division effects efficiency electric currents electric resistance ELECTRICAL MEASURING electrolysis emission enable the Bureau equipment fiscal year 1912 Government departments heating value important improved industrial inspection investigation Isthmian Canal Commission kiln house laboratory lamps large number light lime magnetic test manufacturers melting points ments metals methods of testing miscellaneous mometers neon optical paper pentane photometry physical Pittsburgh branch platinum polarimetry Portland cement prepared primary standard properties pyrometers radiometry reflecting power refractometers researches saccharimeter samples sodium oxalate special tests specifications for Portland standard specifications standard test steel structural materials sumer technical temperature tensile strength testing machines testing of standards tests completed thermocouples thermometers tion Treasury Department users volumetric water-current meters watt-hour meters weights and measures