Popular Science Monthly 



355 



Economizing Gasoline 

 for Automobiles 



com- 

 plug 



A Compensating Vapor 

 Admits Additional Air 



ADEVIC1-: lalkd a 

 pensating \apor 

 has been designed for 

 use on automobiles 

 to economize gas- 

 oline. The two cone- 

 shaped hal\e.s of the 

 plug are di- 

 \ided by means 

 of a leather 

 washer around 

 its c i r c u ni - 

 ference. At its 

 center this 

 washer carries 

 a small hollow 

 piston, the 

 upper of which 

 extends 

 through the 

 washer. A 

 small p i p e - 

 nipple, screwed 

 into the interi- 

 or of the piston, 

 extends down 

 to the bottom 



of the plug portion of tlic de\-ice which 

 is in turn screwed into the intake-mani- 

 fold. This pipe forms a clear passage 

 between the manifold and the half of 

 the device above the air-tight washer. 

 The small piston is provided on opposite 

 sides with two slots opposite similar 

 slots in the sides of the cylinder formed 

 by the screwing-in plug. 



The lower half of the device is provided 

 with a circular hole at one 

 side to admit air from the 

 outside. 



The suction in 

 manifold draws 

 the air out of the 

 upper half of the 

 de\ice above the 

 air-tight washer 

 through the hol- 

 low pipe in the 

 small piston. This 

 forms a vacuum 

 above the washer, 

 making the latter 

 assume the po- 

 sition shown by 

 the dotted lines 



in the cross-sectional view. As the 

 engine speeds up, requiring a leaner 

 mixture, the vacuum above 

 the washer increases, causing 

 latter to move up still 

 farther until the slots in 

 the piston and the cylin- 

 der partly or entirely 

 coincide thus allowing 

 the air in the 

 lower half to 

 pass down into 

 the manifold 

 and mix with 

 the vaporized 

 fuel from the 

 carbureter on 

 its wa>- to the 

 cylinders. As 

 the suction of 

 the engine 

 varies accord- 

 ing to the run- 

 n i n g c o n - 

 ditions, the 

 movement of 

 the piston up 

 and down is 

 such as auto- 

 the amount of air 

 slots according to 



Plug Which Automatically 

 to the Cylinder-Manifold 



maticalK- to regulate 

 jjussing through the 

 the running conditions 



The Layers Can Be Peeled Off as Needed, the 

 Pack Being Still Used as a Strong Solid Shim 



A Shim for Adjusting Plain 

 Bearings in Automobiles 



FOR use in adjusting plain bearings 

 in any kind of machinery, the new 

 type of shim shown in the illustration is 



a time and trouble-saver in 



that it can be peeled off to 

 fit in a few seconds. 

 his is made possible 

 by the fact that 

 the shim is com- 

 [josed of lamina- 

 tions from 2/IOOO 

 to 3/iooo-in. 

 thick. These are 

 forced together 

 luider great pres- 

 sure and act as a 

 solid shim, even 

 when several 

 layers have been 

 removed with 

 \our thumb-nail. 



