Page:Popular Science Monthly Volume 92.djvu/53

 Popular Science Monthly

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�� ��It is tedious work putting the doll actors and actresses through their parts, but the results are worth the efforts expended. The action depends upon the number of poses taken by the figures

��The sculptured figures were changed to different poses and then photographed. In other words, each time a figure moved, a new pose had to be made. Think what that meant! For the ordinary reel of one thousand feet, sixteen thousand separate poses were required to furnish the action!

��Automobile Fuel Keated by Exhaust Gases in Dual Manifold

THE use of heat is perhaps the sim- plest expedient to which engineers have resorted in an attempt to give the automobilist the same number of miles per gallon from the present-day gasoline as that secured from the better grades, sold sev- eral years ago. Present-day gaso- line is more like kerosene than the gasoline of 1912. Kerosene has a greater fuel pow- er than gasoline, but it is harder to get the power out of kerosene than it is gasoline be- cause it cannot be broken up into its elements and

���The exhaust engine gases heat the manifold wall and the incoming fu;l is vaporized

��turned into a combustible gas as easily without some external means. One of these is heat.

In the compound manifold, shown in the accompanying illustration, the ever-pres- ent heat of the exhaust engine gases is used to heat the incoming fuel so that its kerosene element will vaporize more readily and give up its full power. This is accomplished by dividing the manifold into two parts with a metal wall between. The exhaust passes out on one side of the wall and the new fuel comes in on the other. The exhaust heats the dividing wall so that it in turn heats the incoming fuel on its way to the cylinders, where it arrives at a high temperature and in such a highly and completely vaporized state that it gives up its power readily on its explosion. According to some reports, this dual manifold increases mileage from forty-two to fifty- four per cent, and keeps the engine explosion chamber practically free of carbon. *

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