Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 222
may also be readily shown. For chilling water, we some-times use unglazed pottery, which admits of a slight per-colation of the liquid, and thus causes a dewiness on theexternal surface. From that surface evaporation goes on,and the heat necessary for this molecular work, beingdrawn in great part… … which effects this is called the cryophorus, or ice-carrier.It was invented by Dr. Wollaston. The shape of thecryophorus is shown in fig. 59, and it is thus prepared:A little water is put into the bulb, a ; the other bulb, b,while softened by heat, has a tube drawn out from it, witha minute…
Heat
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