. Science of railways . LOCOMOTIVE APPLIANCES. 193 accurate on a locomotive or any moving machin-ery, as the jolt and jar kept the pointer in such aconstant vibration as to prevent a correct reading ofthe pressure being obtained. Each improvement upon this single Bourdon tubegauge consisted mainly in cutting off a piece of thetube, untilfinally the tube did not pass the top vibration and pocket features were thus over-come, but at a sacrifice of the motion of the finally resulted in the introduction of the double. Fig. Bourdon Spring Gauge. Bourdon tube gauge, w
. Science of railways . LOCOMOTIVE APPLIANCES. 193 accurate on a locomotive or any moving machin-ery, as the jolt and jar kept the pointer in such aconstant vibration as to prevent a correct reading ofthe pressure being obtained. Each improvement upon this single Bourdon tubegauge consisted mainly in cutting off a piece of thetube, untilfinally the tube did not pass the top vibration and pocket features were thus over-come, but at a sacrifice of the motion of the finally resulted in the introduction of the double. Fig. Bourdon Spring Gauge. Bourdon tube gauge, which is shown in Fig. 3. Thiswas found to be more satisfactory and free from thetwo former prime objections to the Bourdon principle of this double Bourdon tube is thesame as of the single tube style, and this principlecan readily be understood by noticing the tendencyof a coil of hose to straighten out when pressure isadmitted within it. The other type referred to is the diaphragm gauge,invented in about the year 1849. One of the earlier 194 LOCOMOTIVE APPLIANCES.
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