A comparison of stellar radiometers and radiometric measurements on 110 stars (1915)
Coblentz, W.W. · National Bureau of Standards · leaf 11
kept in the field for any length of time, and aftereach deflection the mirror would take a new zero reading. Whenexamined under a microscope a minute particle of magneticmaterial was found adhering to one of the small magnets. Afterremoving this material no further difficulty was experienced… … Fig. i.—Electrical connections insulation. The total length of this twisted lamp cord wasio.i m, the resistance being 0.3 ohm. A special switchboard wasprovided with a double-pole, double-throw switch which enabledthe observer to connect the galvanometer to a special sensitivitytesting device, S,…
Stars
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