A comparison of stellar radiometers and radiometric measurements on 110 stars (1915)
Coblentz, W.W. · National Bureau of Standards · leaf 17
Fig. 3.—Stellar thermocouples mounted in an evacuated glass container … cobientz) Stellar Radiation Measurements 625 3. THE METHOD USED FOR MAINTAINING A VACUUM One of the difficulties with vacuum radiometers is that they cannot be evacuated and sealed permanently, because vapors are givenoff from the walls of the container and from the lampblack-absorbing surfaces.…
Stars
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