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absorption allowed to enter aluminum foil aperture apparatus applied voltage Calibration curve calorimeter circuits cm thick coaxial cups column gives constant temperature corrected cup in order effects due efficiency of x-ray energy absorbed energy of x-rays enter the absorbing entered the cup equilibrium extend the measurements external temperature filament fluorescence focal spot glass hair felt heat energy heat produced Heating coils Heating currents heating effect high voltage inch thick increase in temperature initial period intensity ionization kilovolts lead absorbing cup lead cup measure the heating measured by means measurements to x-rays milliamperes ohms Resistance peak voltage percent Phys power input present investigation represent readings rise per hour shield shown in Fig slope square subtended tank target Temperature measuring coils temperature rise Terrill thermal thickness of aluminum total solid angle tube was operated Ulrey2 watts x-ray energy x-ray output x-ray production x-ray tube x-rays to enter