. The Locomotive . rable period. A clear stack on an oil burningr installation is usuallv an indica-tion that too much draft is passing through the furnace with a re-sultant low efficiency since all the unnecessary excess of air simplyacts as a cooling agent and carries heat up the stack that ought served in making: steam. 14 THE LOCOMOTIVE, [January, A slight haze coming from the stack indicates that conditions aremore nearly ideal. In order to establish the best furnace conditionsfor any given load, the most satisfactory method is, of course, bymeans of flue gas analysis but in the a
. The Locomotive . rable period. A clear stack on an oil burningr installation is usuallv an indica-tion that too much draft is passing through the furnace with a re-sultant low efficiency since all the unnecessary excess of air simplyacts as a cooling agent and carries heat up the stack that ought served in making: steam. 14 THE LOCOMOTIVE, [January, A slight haze coming from the stack indicates that conditions aremore nearly ideal. In order to establish the best furnace conditionsfor any given load, the most satisfactory method is, of course, bymeans of flue gas analysis but in the absence of the proper apparatusfor this, use can be made of a reasonably reliable and simple the furnace is well alight and the walls uniformly heated upto a high temperature, the draft should be pinched down by graduallyclosing the stack damper to a point where the flames have a slightlysmoky fringe, when the damper should be opened again justsufficiently to clear the flames. An Unusual Flywheel Fig. 1 FLYWHEEL explosions are almost as a rule fraught with spec-tacular damage to the surrounding property and not infrequentlywith distressing loss of life and personal injury. It is rare indeedfor a flywheel to go to pieces without heavy masses of metal being pro-jected through roofs and building walls producing the eflFect of shellfire. However, in the above illustration we show a case of genuineflywheel disruption due to centrifugal force, but there was no damage 1920.] THE LOCOMOTIVE, 15 beyond some major fractures of the hub and arms of the wheel. Theonly usable picture we were able to secure of the wrecked flywheeldoes not clearly show that it was a complete loss. Such, however, wasthe case. The wheel in question was nine feet in diameter and wasused in connection with a refrigerating engine. By the lucky coin-cidence that someone happened to be near the trottle and closed it atthe moment the engine started to race, a complete disruption of thewheel was pre
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