Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . cent discovery of gun-cotton has a very useful application to this instru-ment, and to the galvanic battery generally, as ameans of igniting explosive compounds. The tem-perature at which gun-cotton explodes being onlyabout 360° P., requires a comparatively slight ele-vation of temperature in the wire. For blastingor submarine explosions, this will be an importantadvantage. 60. The Yoltaic Gas Pistol, represented in , is constructed on the same
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . cent discovery of gun-cotton has a very useful application to this instru-ment, and to the galvanic battery generally, as ameans of igniting explosive compounds. The tem-perature at which gun-cotton explodes being onlyabout 360° P., requires a comparatively slight ele-vation of temperature in the wire. For blastingor submarine explosions, this will be an importantadvantage. 60. The Yoltaic Gas Pistol, represented in , is constructed on the same principle as the last-described instrument. The wires pass up through abrass piece which screws into the barrel, they beingcompletely insulated from each other. A sectional Fig. 27. view of this partis annexed. Thefine platinum v\drestretches across be-tween the introductionof a proper quan-tity of hydrogengas may be eflectedin the following manner: Connect with a self-regula-ting reservoir of hydrogen a leaden or other tube, sobent as to deliver the gas under the surface of waterin a jar. The pistol being uncorked, aod the brass. 40 DAVISS MANUAL. piece unscrewed, immerse the muzzle in the jar tosuch a depth that the water may fill one quarter ofthe barrel. Then replace the brass piece, and, bring-ing the muzzle over the end of the tube, open thestop-cock of the reservoir. When the escape ofbubbles shows the pistol to be full of gas, withdrawit, and insert the cork. In this way it will containone volume of hydrogen to three of air, which isthe best proportion. If too much hydrogen is intro-duced, no explosion will occur. It is not, however,necessary to be very particular ; and it will answerthe purpose almost equally well, without goingthrough the troublesome process above, if the pistolis held for a few moments over a jet of the explosion is louder and more certain to occur,if it is filled with a mixture of oxygen and hy-drogen, in the proportion of one volum
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
