Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 140
s put into a mold, which is placed in aspecial furnace and heated very slowly. At last the glass softens andadapts itself to theshape of the mold.The temperature islowered to about1,200° Fahrenheit,and every openingin the furnacestopped up ; afteran exceedinglyslow and careful Fig. 67.—The Lump… … A forty-inchdisc. 134 A Study of the Sky. Bubbles. Striae.
Astronomy
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