ge of the in the boiler when the steam pressure is removed. even more definite experiments were made with glass Thus is destroyed any tendency to form a vacuum over ladle, where they disappear. At first the iron is of a tanks, some with and some without the metal plates. milk-white color; then it… … Drug. enough.— Prof. Thompson. HANLON'S AUTOMATIC WATER FEEDER FOR LOw PRESSURE STEAM BOILERS. > 1892 SCIENTIFIC AMERICAN, INC.
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![An illustration from Catalogue and price list of the Supply Department [serial] (1911)](https://img.insideoutlibrary.com/img/200/ia-cataloguepriceli00asso-15-12.webp)
