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 tlie tread surface. These 

 grooves permit the heat for vulcanizing 

 to reach all poriicjn^ of ilie lire area. 



"^--^-^bji;*'^ 



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. 



