Abstract
Studies made to reduce temperature rise in an interferometric measuring chamber are described. By isolating all energy sources from the interferometer room, the conditions obtained were: the temperature of the air in the room did not vary more than 1/40 deg C STAtotal spread) during 24 hr; the temperature of the measuring chamber was the same within 0.01 deg C throughout a work day in which the lamps were left on but no measurements were made; and the temperature of the measuring chamber rose 0.32 deg C during a normal work day in which four to six platens of gage blocks were measured. Finally the transparent door to the measuring chamber and the entire interferometer were covered with aluminum foil, and all knobs were covered with a plastic insulating material. Now, during a normal work day the temperature of the measuring chamber stays between 19.96 and 20.03 deg C, and during the measurement of any one platen of gage blocks, the temperature does not fluctuate more than 0.02 deg C. (P.C.H.)
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