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Scientific American, Vol. 60, No. 6 (February 1889) (1889)
leaf 7
POP SAFETY VALVE. government would preclude the probability of the stance the danger of overhead wires and their power to This well known valve is manufactured by the Ameri- bonds receiving an ofiBcial quotation. Be this as it inflict accidental death were shown by the same illus- can Steam Gauge… … THE AMERICAS PATENT POP SAFETY VALVE. breaking resistance 70 tons. in the head of the valve proper © 1889 SCIENTIFIC AMERICAN, INCPatents · Munn · Contained · Scientific American · Center · Hot air · Cubic feet · Horse power · American supplement · Wire cloth · Movable cylinder · Coal dust · Electric light · Gases inclosed
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