. Transactions of the American Philosophical Society. the first instance, by preventing the escape of the gas, and, consequently, causing it to dis-place the acid from the interior of the bell, within which the zinc is suspended. This engraving will convey anidea of the calorimotor suitable toeffect the ignition of the platina wirein the galvano ignition apparatusabove described. It should containtwo galvanic pairs, each consistingof two plates of zinc, 10 X 12, alter-nating with three of copper. Thecopper plates of one pair, and thezinc of the other being soldered toa common metallic strip, t
. Transactions of the American Philosophical Society. the first instance, by preventing the escape of the gas, and, consequently, causing it to dis-place the acid from the interior of the bell, within which the zinc is suspended. This engraving will convey anidea of the calorimotor suitable toeffect the ignition of the platina wirein the galvano ignition apparatusabove described. It should containtwo galvanic pairs, each consistingof two plates of zinc, 10 X 12, alter-nating with three of copper. Thecopper plates of one pair, and thezinc of the other being soldered toa common metallic strip, the otherplates of zinc being soldered to onestrip, the copper to another, eachof the last mentioned strips is fur-nished with a gallows screw G these screws and those atW W, (see figure in the text) a com-munication is made by leaden orcopper rods. To complete the circuit, it is only necessary, to depress the handle attached to the pulleys,in order to raise the reservoir of diluted sulphuric acid, and thus to cause it to act on the ARTICLE XXIV. On the Cause of the Collapse of a Reservoir while apparently subjectedwithin to great Pressure from a Head of Water. By JR. Hare, M. D., Sfc., Sfc., Sfc. In September 1834, I was requested by Mr Haydock, a respectableand intelligent plumber of this city, to call at his shop in order to seea copper reservoir, which had collapsed while apparently subjected tointernal pressure, arising from a communication with the mains pro-ceeding from the public water-works. For the purpose of refrigerating the contents, the reservoir wasplaced in spring water, at the bottom of a well, so as to be at a smalldepth below the surface: receiving the river water by one pipe, it wasmade to deliver it by another. The pressure of the water with which the city of Philadelphia issupplied, is known to be sufficient, when at its maximum, to com-mand the most elevated rooms in our dwellinghouses. Hence, hadthe reservoir been burst, it would not ha
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