Popular Science Monthly 



37 





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. * 



