. Automotive industries . ke orexhaust takes place. The valve shaft is rotated at uniformspeed by means of a vertical shaft and helical gears, conse-quently, the valve mechanism is practically noiseless. Thetwo valve disks are backed up by the circular end plateswhich contain the passages to which the inlet and exhaustpipes are secured and one of which also carries a bearingfor the valve shaft. The spark plug is screwed into the combustion chamberwall between the two valve disks. It proved a difficult problem to seal the disk valves, but a form of sealing ringis said to perform this function e
. Automotive industries . ke orexhaust takes place. The valve shaft is rotated at uniformspeed by means of a vertical shaft and helical gears, conse-quently, the valve mechanism is practically noiseless. Thetwo valve disks are backed up by the circular end plateswhich contain the passages to which the inlet and exhaustpipes are secured and one of which also carries a bearingfor the valve shaft. The spark plug is screwed into the combustion chamberwall between the two valve disks. It proved a difficult problem to seal the disk valves, but a form of sealing ringis said to perform this function effectively. These ringsare set into ring grooves in the valve seats surroundingthe valve ports therein. Another important problem inconnection with an engine of this kind is the lubricationof the valve mechanism. In the engine here shown thisis effected entirely by pressure. In a four-cylinder enginewith this valve construction it is necessary to cast the cyl-inder head separately and split it through the valve Sectional Views of Stevens Rotary Valve Englni Measuring Surface Tension THE common method of determining surface tensions,by means of capillary tubes, is subject to the dis-advantage that long capillary tubes of uniform bore arehard to find as well as to keep clean; besides, the menis-cus is subject to cooling which has a strong effect onthe surface tension. A new method which overcomesthese difficulties was described in two papers recentlypresented to the Faraday Society by Allan Fergusonand P. E. Dowson of Manchester College of of measuring the rise of the liquid, Fergusonand Dowson force the liquid down to the lower end ofthe capillary, dipping vertically intothe liquid, and they measure the pres-sure required for this in a suitablemanometer. The liquid is placed in abeaker resting on a movable capillary tube, which is dippedinto the liquid, may be short; it isfused to another glass tube leadingover to a mercury bottle; by rai
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
