Page:Popular Science Monthly Volume 91.djvu/957

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Popular Science Monthly

��equal parts of 30 deg. each. Two of them added together give an angle of 60 deg. The other one is divided into three equal parts of 10 deg. each, two of which added together give an angle of 20 deg.

The circle, Fig. 8, shows how tee-joint

��/ 90°

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�I 30° '^7

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���Dividing a circle into degrees to obtain the right angle in drafting an elbow, pattern

angles may be laid out quickly by this method. Just suppose that a tee-joint of 50 deg. is required. Draw the circle and divide it into four quarters, each of which will be 90 deg. Take one of these quarters and divide it into three equal parts. These will be 30 deg. each. Take the middle one of these and divide it into three equal parts of 10-deg. each. If a 30-deg. angle is added to two 10-deg. angles you will have a 50-deg. angle, which is the angle desired. Draw tne front view of the tee-joint on the 50-deg. lines as shown in the drawing.

��A Garden Hose Used as a Form for Cement Pipe

A FARMER wanting to construct" a cement pipe to conduct water from a spring into the house and barn, dug a suitable ditch, poured in part of the con- crete, and placed a hundred feet of garden hose in the center, filling up the ditch. Before the hose was placed in the ditch it was filled full of water with a force pump. When the cement set, the water was allowed to run from the hose. Then the hose was easily pulled out and used for the next hundred feet. — F. E. Brimmer.

��941

��Repairing a Scratch on the Varnish of an Automobile

IF the scratch has gone no deeper than the finishing coat of color, take a fine thin striper or pencil, and draw a fine line the entire length of the scratch, endeavoring to fill the depression, but not running over the edges.

The varnish should be thinned with tur- pentine so that it will give a smooth sur- face and dry rapidly.

If you don't happen to fill the scratch, it will be all right as long as you get it glossed over. To be sure, the line may show on close examination, but from a short distance it will be invisible. — James M. Kane.

��Eliminating Noise from Shift Levers On an Automobile

A CAR that had developed a case of noisy shifting levers for both change speed gears and the brake was recently brought into our garage. An examination revealed the cause of the trouble to be the bushing of the lever hubs against the gear case when the gears were being shifted or the emergency brake applied. We in- serted a comparatively light helical spring beside the hubs of both levers. These springs served a twofold purpose. They helped to minimize the shock when shifting, and prevented the lever hubs from touching the case, thus entirely eliminating the noise.

When employing a remedy of this kind, care should be taken to make the springs of wire that will not cause trouble in shifting,

��BRAKE LEVER

���Coil springs inserted between the shift levers to take up wear and prevent noise

and to see that the springs when compressed do not occupy too much space; otherwise the amount of travel allowed for the shifting may be decreased to such an extent as to prevent proper shifting. — Adolph Klein.

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