. Electrical news and engineering . his, it was asserted, would be vastlymore costly operators. CANfiDlflN EUECTRlCAb NEWS April, 1897 A SHIFTED ECCENTRIC. By Capt. James , Montreal. Some time ag-o an automatic engine in this city that had form-erly worked to the satisfaction of all concerned, began to fail, andgot worse and worse. The owner rented power to six tenants,each one taking his quota from the main shaft, and the pulleysfor the purpose required were sized to agree with an enginespeed of 75 revolutions per minute. It had jfot so tliat the engine could not keep up speed if
. Electrical news and engineering . his, it was asserted, would be vastlymore costly operators. CANfiDlflN EUECTRlCAb NEWS April, 1897 A SHIFTED ECCENTRIC. By Capt. James , Montreal. Some time ag-o an automatic engine in this city that had form-erly worked to the satisfaction of all concerned, began to fail, andgot worse and worse. The owner rented power to six tenants,each one taking his quota from the main shaft, and the pulleysfor the purpose required were sized to agree with an enginespeed of 75 revolutions per minute. It had jfot so tliat the engine could not keep up speed if more shading. This space in the originals was covered with expansioncurves impossible to separate. The characteristics of a good diagram from an automaticengine are : 1st. That the admission line from the beginning of the stroketo cut-off should closely approach the boiler pressure. 2nd. That cut-off should be as sudden as possible. 3rd. That at any point in ttie expansion curve the same weightof steam is practically accounted than half the work wasput on. For a couple of days complaintsfrom the tenants were in order. The owner was willing to doanything required. A man from a shop tinkered the governor ;another recommended reboring of the cylinders; an expertlooked wise and gave a heap of good advice. After all, no im-provement had been effected, and tenants said it was going frombad to worse. Some acquaintence of the owner suggested thatthe indicator should be used. Whenthis had been decided the cylinderwas piped in such a manner thatindicators at each end of the cylindercould be simultaneously only one indicator is used onan engine that is subject to greatand sudden changes in load, the ob-tained data may, in many respects,be misleading. .Fig. I was the first diagram glance proves that the eccentrichas slipped backward on the shaft. In taking the accompanying dia-grams a patent reducer simultan-eously operated the paper barrels ofboth indicators. I
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