. The Locomotive. old good. In the case of the plate fixed on four edges we have considerableleeway if we attempt to follow the upper diagram. Of the threecurves shown, the middle one appears to be the most reasonable,although tests made by J. Montgomerie {Engineering, London, June13. 1919) would indicate that the actual plate stress is about sixtyper cent of the stress given by the formula from which the curve isplotted. — The Water Tower. Purchaser — What is the charge for this battery ? Garageman — One and one-half volts. Purchaser -— How much is that in American money ? — The Forgt 236 THE
. The Locomotive. old good. In the case of the plate fixed on four edges we have considerableleeway if we attempt to follow the upper diagram. Of the threecurves shown, the middle one appears to be the most reasonable,although tests made by J. Montgomerie {Engineering, London, June13. 1919) would indicate that the actual plate stress is about sixtyper cent of the stress given by the formula from which the curve isplotted. — The Water Tower. Purchaser — What is the charge for this battery ? Garageman — One and one-half volts. Purchaser -— How much is that in American money ? — The Forgt 236 THE LOCOMOTIVE. [October, Steam Turbine Accident At Pittsfield, Massachusetts. IT is often claimed that a turbine which is direct connected to acentrifugal pump or blower is in no danger of serious overspeedand so an emergency stop mechanism is not essential. The theoryon which this claim is based is that with such apparatus there is al-ways a load on the machine and, in case of a tendency to overspeed. the. Fig. increases so rapidly that, although there may be a little increasein speed, there is no danger of a so-called runaway and a resulting ex-plosion. One point that seems to be generally overlooked is that therotor vanes of a blower may distort and break either by increasedpressure or centrifugal force when the speed increases. This has ac-tually been observed in a few cases. An accident of recent occurrence,moreover, seems to discredit the above theory, inasmuch as the evi-dence points to the initial failure of the turbine from overspeed andsubsequent wrecking of the pump. On June 12, 1925, a 60 horse-power turbine exploded in the plantof the Pittsfield Electric Co., Pittsfield, Mass. The turbine wasdirect connected to a boiler feed pump and operated at 2800 governor, of the usual revolving weight type, was located on the I92S-] THE LOCOMOTIVE 237 end of the shaft. The evidence indicates that some part of the gov-ernor failed first and thus preve
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