Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 42
t vapour, but liquid water in a state offine division, will form within this glass vessel k (fig. 8),when the air is pumped out of it; and to make the effectvisible to those right and left of me, as well as to those infront, eight little gas jets are arranged in a semicirclewhich half surrounds the… … receiver, and many of you see a colouring of the cloud,as the light shines through it, similar to that observedsometimes, on a large scale, around the moon. Whenthe air is allowed to re-enter the vessel, it is heated;the cloud melts away, and the perfect transparency of theair within the receiver…
Heat
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