uses, except in the air within the tube is repeatedly carried through placed to the west a little before noon when the sun extreme cold weather. With all surroundings con- the system and churned over and over. Thus the is in its southern declinations, and can be shifted ducive, it is not unusual… … mences to play. ations in transparency of THE TWO-MIRROR CffiLOSTAT 07 THE SMITHSONIAN ASTROPHYSICAL OBSERVATORY.
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