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accuracy amperes angle Angstrom units angular angular aperture aperture apparatus armature axis Baker Heater basalt bolometer calorimeter candle-power cent circuit column comparison constant corresponding curve determined deviation diffraction dilution direction distance Disturbing dynamo effect electric electrical conductivity electromotive force equal equation expansion drum eyepiece field formula freezing-point galvanometer given glass grating heat horizontal inches increase infra-red instrument interval iron lamp light lines of force magnetic magnetic circuit mean hor Mean sph measured metal method mirror molecular depression motion motor mounting muzzle observed obtained parallel photographic placed plane plate poles position produced projectile purity pyrometer reading reflecting refracting resolving power ridge lines rocks rotation screen series coils shown slit solution specific gravity spectra spectroscope spectrum surface Table telescope temperature theoretical thermometer Thomson-Houston tion tube values velocity vertical voltage volts Watts wave wave-lengths width wire zero zero-point