Page:Popular Science Monthly Volume 92.djvu/939

 Popular Scietice Mouthhj

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��known, and it consumes very little of the power passing through it. The ball bear- ing is divided into several classes. There is the annular ball bearing, which has races in the form of rings, and there is also the bearing which has a holder or race "L" shape, with curved sides facing the balls. This is known as the cup and cone

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� ��Connecting rod end with a split babbitted bearing that can be readily replaced

bearing, and these are adjustable, while the annular bearings are not. This type of bearing is also classified according to the way in which it carries its load, as thrust or radial. Ball bearings are built which withstand both radial and thrust load. Then again, bearings of this char- acter are built which have two rows of balls. To work properly these balls must not vary in size more than one ten- thousandth of an inch. If one ball is worn through under-lubrication all of the balls of the set should be replaced with new ones. While oil is used to lubricate the plain bearing, medium weight cup grease should be used for the ball and roller bearings, and the best grade of grease is none too good.

Every time the bearing is removed from the car it should be washed thoroughly in kerosene and dried on a clean, dry rag. The bearing should be kept free from water, dirt, grit, or other foreign sub- stance, any of which might be sufficient to ruin the entire bearing assembly. Be- fore replacing the bearing, after it is washed, fill it with new, clean grease. Caution should be exercised in tightening the bearing in its housing. See that the nuts are turned down evenly so as not to cramp the bearing in any way. The operator should never hurry in replacing the bearing. He should see that every step in the work is done right before proceeding.

��Strengthening Hammer Handles with Steel Strips

A'^LAW hammer of the usual kind with a wood handle may be made very strong for heavy work, such as pulling very large nails. This can be done by sawing out an opening in the handle from the hammer head back past the center of the handle an inch or two and inserting a strip of very narrow old .steel buggy tire and securing in place by drill- ing small holes through both handle and buggy tire strip. The proper place for the holes is just back of the hammer head, one in the center, and one just back of the center an inch or two from the end of the buggy tire strip. Sometimes the drilling may be dispensed with by selecting a strip of buggy tire with bolt holes in the proper places.

A Wall Hanger for the Ordinary Electric Lamp Stand

THE illustration shows a sim.ple de- vice for using an adjustable elec- tric stand lamp as a wall lamp at the head of bed or couch. The de- vice consists of three strips of wood screwed to the wall in the shape of a half hexagon and three narrower strips nailed on to them so as to extend over the inner edge, forming a groove

���The desk lamp as it hangs on the wall

��into which the base of the lamp can be inserted and held firmly. Being ad- justable, the lamp affords a reading light at whatever angle the person reclining on the couch desires. — F. L. Clark.

��An Inexpensive and Effective Aluminum Polish

THE following is a fine polish for aluminum ware. It is made by mixing ammonia and water in equal quantities, and then adding the mixture to sufficient borax to make a paste about as thick as paint. Apply with a thick soft cloth and polish with canton flannel.

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