Scientific American Volume 47 Number 18 (October 1882) . ing thespring. During this time the other knife-arm slides inthe aperture of the crosspiece, and, at the precise mo-ment at which, through its presence there, it is aboutto change the distribution, the spring, which has gonebeyond its maximum point, stretches and suddenly opensthe valves, S, while at the same moment the second valvesclose. As the inlet is then in communication with thebottoni of the piston, the latter instantly redescends, drivingout through the outlet the water that it has measured duringits travel. The motion then take
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Scientific American Volume 47 Number 18 (October 1882) . ing thespring. During this time the other knife-arm slides inthe aperture of the crosspiece, and, at the precise mo-ment at which, through its presence there, it is aboutto change the distribution, the spring, which has gonebeyond its maximum point, stretches and suddenly opensthe valves, S, while at the same moment the second valvesclose. As the inlet is then in communication with thebottoni of the piston, the latter instantly redescends, drivingout through the outlet the water that it has measured duringits travel. The motion then takes place in a contrary direc-tion, until the top of the groove in the piston-rod produces, As regards the length of time that the Jacquetmeter will work well, it must be remarkedthat provision is made against wear by a sandbox placedat the inlet to the apparatus, and which prevents graveland other solid bodies from entering the distributingchambers; and, as regards all plastic impurities, such asmud, carbonate of lime, etc., that the water might hold in. Fig. 4.-TEANSVEBSE SECTION. suspension, no deposit of these is to b« feared. The piston, in fact, working vertically, deposits could only occur onthe bottom of the cylinder or the top of the piston, with-out ever being in contact with the parts in friction. Finally, the knife, which, with the spring, is the delicatepart of the meter, is made of bronze of a hardness equal tothat of steel. Moreover, although the great elasticity of the fig. 3.-H0BIZ0NTAL SECTION. utes it exploded violently. This tube had often beforeborne a rise of temperature to 31°. The explosion is attrib-uted to thermal expansion of the solid carbonic acid (as amore likely cause than vapor-pressure on glass renderedbrittle by a low temperature). In the second case, a large sheet zinc bell-gasometer, usedexclusively for keeping oxygen gas, was concerned. It hadstood about six months unused, containing a little ofthe gas. When the issuing gas was being tested w