Page:Popular Science Monthly Volume 89.djvu/952

 938

��Popular Science Monthly

��Replacing a Knob on an Aluminum Kettle Top

IF the knob is broken from an aluminum kettle cover, a large ragged hole is left which will render the kettle practical- ly useless. If the edges are filed smooth

���Two washers and a stove bolt used to repair the broken cover of a kettle

and two tin roofing-caps are used as washers, one on the underside and the other on the outside of the cover, and the knob fastened with a small stove bolt, as shown in the illustration, the kettle will be as good as new.

��HARD

��sJOIt HO* HUT.IOUCHU B« ,GROOV[

��Grooves Necessary in Giant Motor- Truck Tires

FOR several years solid rubber tires for motor-trucks were ne\er made wider than 7 in., and where necessary to have them wider, a twin or dual tire was used on each wheel. Tires of greater width than 7 in. gave poor results as the tread would separate from (iAoiAnoN OF Hw IN VULCANISING FR0CLS5 the basc. Tests have proven that this sepiaration was caused by in- sufficient vulcan- izing of the rub- ber near the base. Increase in the width called for an increased thickness of the area and this would not vulcan- ize uniformly. If the rul)ber near the base of the tire was properly \-ulcanized it usually happened that near the tread would be overcured and brittle, while if the latter was properly vulcanized the jiorlion near the base would be soft and puttv- like.

A great deal of experimenting solved the problem by forming three deep grooves in the tread surface. These grooves permit the heat for vulcanizing to reach all poriicjn^ of ilie lire area.

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��ViOOO LILOS.

��Three grooves to cure tires properly

��Making Screws Hold in the End Grain of Wood

THE very nature of the grain running lengthwise makes it exceedingly hard to fasten the threads of a wood screw so that it will hold for any length of time. Where it is necessary to fasten the joints of wood in the fashion shown in the illustration, one of the best methods is to insert a wood pin in a hole bored cross- wise with the grain. The size of the pin will depend on the joint and on where it is used. In fitting the pin to the hole make it large enough to drive in snugly. A little glue applied to the surface will fasten it in place.

���A wood pin in a hole bored across the grain

��Adjusting a Storm Sash from the Inside of a House

��B

��Y applying the following method, a storm sash may be adjusted from the inside of a house. Two pins are driven into the top rail of the sash and holes pro\id- ed in the win- dow casing at the top to receive them. The pins may be made either of 3-in. nails with their heads re- mo\ed or .short lengths of dowels. The loca- tion of these pins is shown at .1. To install the wiiuiow, push it through the opening left by raising the

���Storm sash applied from the inside

��lower sash, set the i)ins in I lie holes and ]>ull the bottom in place. The lower i>art is held with two small hooks as shown at B. Slorm sash pro\i(]c(l with holdings ol this kind re(|uirc no i.uliieis to put tlu'm in place on upi)er windows.

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