| Show Whistle WInstle Helps MeasurePressules \ Meisure l\Ie'lsure l Ie'lsure Ielsure Measure MeisurePressuies ' Pressuies Pressules PressUl es in 111 Engines Engmes EnginesHow EngmesHow How to measure the volume of the thecompressIOn thecompression thecompression compressIOn space above the p a atons s.tons stons . tons of an internal combustion en eng eng eng g ne without removing removlDg the cyl n nder nder nder der head has been becn solved by the lD in lDventlon inventton invention ventlon ventton of a v.h vh wh . . stl sting ng gauge The Therate Therate Therate rate of vibration of the air atr mclosed inclosed inclosedin mclosedm m in the cylinder cylmdcr head is compared comparedwIth comparedwith comparedwith wIth that of air inclosed in m an ad adJustable adjustable adjustable Justable and cal brated chamber of ofknown ofknown ofknown known volume by employing employmg two twoidentIcal twoidentical twoidentical identIcal identIcalhlstles \ whistles \\hlstles hlstles one attached to toone toone toone one sparkplug sparhplug port of the engine cngme and andthe andthe andthe the other to the adjustable cham chamber chamber chamber chamberThe ber berThe The whistles are blown by aIr aIrhav airhay airhav hav hay ng a common supply and con constant constant constant stant pressure says Popular Mechamcs Mechanics Me | chanics chamcs The pitch of the notes ofthe ofthe of Ithe the whistles on the tv two . 0 chambers chambersdepends chambersdepends chambersdepends depends upon the volume of air con contamed contamed contained tamed in them Thus when notes notesof notesof notesof of the same pitch are produced the thevolumes thevolumes thevolumes volumes of the two chambers are areequal areequal areequal areequal4 equal -4 4 "It It " - |
