Stationary steam engines, simple and compound; especially as adapted to electric lighting purposes . re, in turn, again made it necessary,apparently,to place the governor on the main shaft, and to meetthe effort of centrifugal force by a counterbalancing action,which could then only be obtained by the use of steelsprings set in the casings of the governor. But the use ofsprings is considered by many engineers to be so objec-tionable, that they would submit to some expense and inconrvenience to avoid their application, if possible. The objec-tions are that they are liable to changes of tension
Stationary steam engines, simple and compound; especially as adapted to electric lighting purposes . re, in turn, again made it necessary,apparently,to place the governor on the main shaft, and to meetthe effort of centrifugal force by a counterbalancing action,which could then only be obtained by the use of steelsprings set in the casings of the governor. But the use ofsprings is considered by many engineers to be so objec-tionable, that they would submit to some expense and inconrvenience to avoid their application, if possible. The objec-tions are that they are liable to changes of tension and oflength while at work, that they never have a definite andcalculable strength, that they are liable to break in mostunaccountable ways, and at most unreasonable and unex-pected times, and that the adjustment of a balance betweenthe two equilibrating forces is often difficult and almost alwaysunsatisfactory. These objections undoubtedly do to a certain ELECTRIC LIGHTING PLANTS. 91 extent exist; but they as certainly are not as serious as isoften supposed. The writer has had a long experience. The Cummer Governor Section. in this direction, both in the use and in the observationof the steel spring for a wide variety of applications,and has never yet seen reason to condemn them unre- 92 STEAM ENGINES FOR servedly. The principal objection which can be urgedagainst the governor of this class, as usually adopted for thekind of engine now under consideration, is probably thefact that it cannot be reached while the engine is in opera-tion, and that change of speed is thus made impossibleexcept by stopping the machine and making changes in theadjustment of the springs, then trying the speed again, andagain stopping to adjust, until the desired speed is exactlyattained, which disadvantage is shared by the older arrange-ment of governor. The form of the Cummer governor, which has been de-signed to evade these objections to the use of springs, andto secure certain special advantages,
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