784 



Popular Science Montldy 



Estimating the Speed of Passing 

 Automobiles 



YOU ctin calculate the speed of pass- 

 ing automobiles, without leaxing 

 your house. Measure off 132 ft. on the 

 street, marking each end with slacked 

 lime. With a little practice, it will be 

 possible to note, on the dial of a watch, 

 the exact time taken in traversing this 

 distance. The following table shows the 

 rates of speed : 



I 



ih 



2 



h 



4 



4' 



5 



5i 



6 



7 

 8 



9 



10 

 II 

 12 

 14 

 15 

 18 

 20 

 22 

 25 

 30 

 45 



Sec. 



go miles per hour 



.60 



45 



.36 



■30 



.26+ 



.22+ " 

 .20 " " 

 .18 " " " 



.16+ 



■15 ' 



•13 



.11+ 



.10 ' 



. 9 " " " 



. g_^ „ .. .. 



■ 7+ 



. 7+ 



, 6 



6 ' 



4^ 



■ 4+ 



3^ 



3 " " .. 



A series of tests showed the average 

 speed of an automol^ile to be 6 sec. ; horse 

 trotting, 14 sec; a man walking, 30 sec; a 

 woman walking, 45 sec. — D. L. Mkrrii.i.. 



T 



HK 



to 



Making a Sediment Pocket in Feed 

 Line to Carburetor 



NO MATT1:R h(nv carefully fuel is 

 filtered when filling the automobile 

 or motor-boat tank, a certain amount of 

 impurities will be poured in with the 

 gasoline, which the ordinary fuel filter 

 using wire gauze screens does not prevent 

 from reaching the carburetor. While a 

 screen will retard lint or scale, it will 

 permit particles of rust or small drops of 

 water to pass through. If the gasoline 

 pipe is joined to the carburetor with an 

 elbow, as shown at A, the dirt or water 



A Practical Pulverizer Made From 

 a Cutter- Bar 



illustration shows a pulverizer 

 crush clods and jiulverize the 

 ground. It con- 

 sists of a cutter- 

 bar taken from an 

 old binder and 

 bolted to the front 

 member of the or- 

 dinary road drag. 

 The bar is ]ilaced 

 at an angle so 

 that the trash will 

 not hang upon il. 

 The guards of the 

 bar will ju'iietrate 

 the ground, l)reak u|) the clods and 

 smooth the ground very satisfactorily. 



Binder cutter-bar on 

 front crosspicce 



A tee joint in the Une below the carburetor 

 forms a place to catch the sediment 



is apt to collect, resulting in erratic 

 engine operation because the flow of 

 gasoline is impeded and at times in- 

 terrupted altogether. 



The method shown at B is a superior 

 one. A tee-fitting is used insteail of an 

 elbow and the ojien end is plugged with 

 a stand.ud pipe i)lug. Impurities then 

 colled in the l)ottom of the tee instead 

 of llowing into the carburetor or con- 

 stricting the passage. A piece of pipe 

 I or 2 in. long, capped at the end, may 

 be substituted for the pii^e plug. This 

 gives a larger sediment chamber; or a 

 standaixl pelcock may be used at the 

 bottom of the tee, jiroxiding a means 

 of drawing off the dirt readily. 



Till-. \.ihie of millstones produced in 

 the United States dn)|>ped from 

 two hundred thousand dollars in i8«o to 

 forty-three thousand dollars in 1915. 



