22 inches of water, 7 inches above style of boiler, and can be readily ap- the fire line, was exploded at a pressure plied, internally or externally to new or of only 235 lbs., 65 lbs. less than the old boilers. boiler had withstood with Lawson's de- Figs. 1 to 7 fully illustrate the inven- tion.… … END VIEW High Pressure. On the 16th of that month Mr. Law- This discovery and invention remove son, at Munhall, near Pittsburgh, Pa., all obstacles to the use of high pressure. publicly tested his theory, and exploded With iinnranity against explosion, a boiler of the ordinary style having a higher…
Engineering
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