Journal of electricity, power, and gas . thereby increasing .the efficiency. Good com-mercial engines have been on the market, especiallyin Germany, since 1900, and in the last few years theyearly production has increased immensely all overEurope. Mr. Diesel has often stated that his principleis especially suitable for an engine using two strokesto complete the cycle, because the scavenging is notdone with a fuel air mixture, but with pure air, so thatnot only premature ignition, but also fuel losses, are avoided, and the scavenging can be done very effec-tively. So far, however, the four-cycl
Journal of electricity, power, and gas . thereby increasing .the efficiency. Good com-mercial engines have been on the market, especiallyin Germany, since 1900, and in the last few years theyearly production has increased immensely all overEurope. Mr. Diesel has often stated that his principleis especially suitable for an engine using two strokesto complete the cycle, because the scavenging is notdone with a fuel air mixture, but with pure air, so thatnot only premature ignition, but also fuel losses, are avoided, and the scavenging can be done very effec-tively. So far, however, the four-cycle principle hascome into most extensive use. This principle worksas follows: During the downstroke of the piston, atmosphericair is sucked into the cylinder and on the return strokethis air is compressed to between 500 and 600 lb. persq-. in. The temperature (about 1000 degrees F.) dueto this compression is high enough to ignite theatomized oil, which is forced into the cylinder at theend of the compression stroke. This oil burns slowly. Electric-Driven Hoist on Motor-Ship Siam. in the cylinder, keeping the pressure constant be-tween 500 and 600 lb. per sq. in. until the admissionvalve closes and the expansion commences. At theend of the stroke the exhaust valve opens and duringthe return stroke all gases are expelled from the cyl-inder and the cycle is completed. The four-strokecycle engine has a better combustion and 15 to 20 percent less fuel consumption than the two-stroke cycleengine. Some engineers are doubtful whether thissupremacy will last much longer, and think the two-stroke cycle engine with its smaller cylinders willcome into favor soon. At several large German worksexperiments are being made on double-acting two-cycle engines where as high as 2500 per cylinderhas been obtained. At the present time, however,such large output per cylinder is not a commercialreality. To determine the dimensions of any size enginethe value of the most economical mean effective pr
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