Page:Popular Science Monthly Volume 89.djvu/798

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��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 :










7 8


10 II 12 14 15 18 20 22 25 30 45


��go miles per hour






.22+ " .20 " " .18 " " "


■15 '



.10 '

. 9 " " "

. g_^ „ .. ..

■ 7+

. 7+

, 6

6 '


■ 4+


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..




��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.

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