. Factory and industrial management. HULLANU bLliAlAKINE TUKPEDU BOAT READY FOR LAUNCHING, CRESCENT SHIPYARD. ELIZABETHPORT, N. by electric storage battery (Electric Boat Co.) when submerged and by Otto gaso-line engines when running on the surface. small boats, in which the amount of room that would he taken up by areversing gear would materially reduce the available space, the reversi-ble propeller is exceedingly well-adapted. The reversible engine referred to in the last paragraph is of thetwo-cycle type, and the change of direction is accomplished bv slowinq^the engine down unt
. Factory and industrial management. HULLANU bLliAlAKINE TUKPEDU BOAT READY FOR LAUNCHING, CRESCENT SHIPYARD. ELIZABETHPORT, N. by electric storage battery (Electric Boat Co.) when submerged and by Otto gaso-line engines when running on the surface. small boats, in which the amount of room that would he taken up by areversing gear would materially reduce the available space, the reversi-ble propeller is exceedingly well-adapted. The reversible engine referred to in the last paragraph is of thetwo-cycle type, and the change of direction is accomplished bv slowinq^the engine down until it has nearly stopped, and then giving it an ex-tremely early ignition which stops the piston and drives it backward ;the throttle is then opened and the engine continues to run backwarduntil again reversed. Starting devices as employed for marine engines. 354 THE MOTOR BOAT. 353 are of various kinds. In many an air pump geared to the propellershaft is employed to keep full a reservoir of air at from 40 to 109pounds pressure. The air is piped to the compression space of theengine and passes through an ordinary plug cock just outside thecvlinder. To start the engine by compressed air the flywheel is turnedover until the ]:)iston of one c}iinder is just past the top of its cock on that cylinder is then opened full and the pressure of the airdrives the piston downward. The air is cut off before the pistonreaches the end of its stroke and sufficient momentum is tisually de-rived from this one impulse of the air to permit the engine to take up itscvcle. In other engines a charge of gasoline vapor and air is pumped
Size: 1360px × 1838px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
