Popular science monthly . else had been tried without curingthe trouble, the valve-chamber capswere tapped out w-ith a J-2-in. pipe tapso the plugs could be screwed in enoughto eliminate the pocket entirely asshown at B, and the edges of the tappedholes were chamfered to make sure theplug would project into the largechamber in the valv^e-cap. After theparts had been replaced, and the car-buretor restoried to its original condition,all misfiring ceased. The explanation is that at low speeds,owing to imperfect scavenging and lowrate of inlet gas flow, some dead gasleft from a previous explosion
Popular science monthly . else had been tried without curingthe trouble, the valve-chamber capswere tapped out w-ith a J-2-in. pipe tapso the plugs could be screwed in enoughto eliminate the pocket entirely asshown at B, and the edges of the tappedholes were chamfered to make sure theplug would project into the largechamber in the valv^e-cap. After theparts had been replaced, and the car-buretor restoried to its original condition,all misfiring ceased. The explanation is that at low speeds,owing to imperfect scavenging and lowrate of inlet gas flow, some dead gasleft from a previous explosion collectedin the small pocket around the plug-points; when the spark took place, theignition function was erratic because ofthe poor gaseous mixture surroundingthe plug-electrodes. Bringing the pointsfurther into the combustion chambereliminated this condition, because theelectrodes were swept by the fresh gasat every \V. PAofi. 126 Popular Science Monthly _CtAR FOR DRIVINGMACHINE NO. 1 SHIFTING BOLTS. Plan of motor serving two drives. Turninga bolt makes the shift One Geared Motor Serves Two Drives THIS diagram illustrates a goodmethod for making one gearedmotor serve two drives. Line up thetwo large gear-wheels No. i and No. 2,as shown in the diagram. Set the motorso that the motor-pinion falls betweenthem. It must not engage both largegear-wheels at once. As shown here,the motor is driving machine No. i. Bysimply turning tlie shifting-bolts (usuallythere is only one shifting-bolt on amotor), the power is (]uickly a[)[)lied togear-wheel No. 2 for driving machineNo. 2.—N. G. Near. A Pocket-Clip for Pencils A (LIP for holding pencils and foun-tain-pens in the pocket can Wmade from a paper-fastener. One endof the fastener is straightened and woundtightly about the pen or pencil, whilethe other end lies flat in a lengthwiseposition. aig=aViElit-ill—I Building an Oil Reservoir ASIMPLL and useful outfit for thestf)rage of oil or other liciuids isshown in th
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
