Popular Science }f()nfhl// 



353 



Fifty-Seven Miles an Hour in 

 a Ford! 



ANY owner of an automobile with a 

 X\ detachable head motor -such as a 

 Ford has — may increase the speed of his 

 car from fifty to sixty per cent by means 

 of a sixteen-valve-in-the-head cylinder 

 attachment, shown in the accompanying 

 illustrations. As much as fifty-seven 

 miles an hour have been reached with a 

 Ford. 



No machine work is necessary to install 

 the attachment. Although sixteen valves 

 instead of eight are employed on the four- 

 cylinder engine, the same valve push-rods 

 are used. This is made possible by an 

 ingenious lever arrangement on the top 

 of the head. All the channels previously 

 used for intake and exhaust are converted 

 into intake passages alone; the area for 

 the incoming gases is doubled and simi- 

 larly those for the exhaust. By reason of 

 this increase, and by placing the spark 

 plug directly in the passage over the pis- 

 ton head instead of off to one side, as in 

 the regular Ford L-head engine, the larger 

 volume of gas is more quickly ignited and 

 more thoroughly burned. Similarly, the 

 burned gases are instantly released with 

 but a very small back pressure, so that 

 they are completely expelled before the 

 admission of the next incoming charge. 



Just how efficient such an attachment 

 is, is not stated. Probably, it is chiefly of 

 use on racing cars, 

 are shot in and out 

 of cylinders so 

 rapidly a waste en- 

 sues. Wear on parts 

 is also greater. 

 Imagine a little 

 Ford scrambling 

 down a race track, 

 this new attach- 

 attachment on its 

 engine! From un- 

 der its hood comes 

 a roar, the wheels 

 whir, the fenders 

 clatter, sundry 

 parts threaten to 

 leave themselves 

 along the right-of- 

 way. "Too much 

 is enough," groans 

 the Ford. 



Usually where gases 



Showing exterior and details of 

 the new sixteen-valve-in-head 

 attachment for Ford motors 



The physician has his hands free for the 

 examination of his patient's mouth or eyes 



He Holds the Light So That the 

 Hands Are Free 



SOMETIMES a doctor must examine 

 the mouth, the throat, or the eyes in 

 order to make a correct diagnosis. The 

 ordinary electric pocket light is not con- 

 venient because in using it the doctor 

 does not have the 'ree use of his hands. 

 Dr. Alfred Kahn, of New York University, 

 has invented an ingenious light which the 

 physician may hold in his mouth. The 

 simple construction 

 of this light, its 

 triple ball bearings, 

 its lightness of 

 weight, and the fact 

 that it can be bent 

 around one finger 

 or held by the fiber 

 mouthpiece be- 

 tween the operator's 

 teeth make it ex- 

 tremely useful to 

 the general practi- 

 tioner. Another ad- 

 vantage of the Kahn 

 light is that it may 

 be perfectly steril- 

 ized. Doctors es- 

 pecially like a lamp 

 of this kind for 

 emergency calls. 



