Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 95
is calculated to supply an area of 100 ft. The valve, a leaden disc affixed Now, the Parmelee sprinkler takes a considerable time to open — over two to the centre of a larger disc of brass, is held up against the valve orifice by minutes usually — owing to the length of the solder seam, and the… … Closed. Grinnell sprinkler, open. metal frame (Figs. 40-42). The valve- shown, by the tests made by Wood- seat is itself made elastic by the device bury, to be about the least sensitive of fixing it in the centre of a diaphragm head on the list, and the least in capa- of thin, hard metal,…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
