[Illustration:  Commutator Parts]

post nut.  The shape of this nut made a good pulley for a cord belt.  —­Contributed by John Shahan, Attalla, Ala.

** Rocker Blocks on Coaster Sleds [223]

The accompanying sketch shows a coasting sled with rocker blocks attached on both front and rear runners.  The runners and the other parts of the sled are made in the usual way, but instead of fastening the rear runners solid to the top board and the front runners to turn on a solid plane fifth wheel, they are pivoted so each pair of runners will rock when going over bumps.

The illustration will explain this construction without going into detail and giving dimensions for a certain size, as these rocker blocks can be attached to any coaster or toboggan sled.  It will be noticed that the top board may bend as much as it will under the load without causing the front ends of the rear runners and the

[Illustration:  Coaster Sled with Rocker Runners]

rear ends of the front runners gouging into the snow or ice.  —­Contributed by W. F. Quackenbush, New York City.

** How to Make a Watch Fob [223]

[Illustration:  Watch Fob]

This novelty watch fob is made from felt, using class, college or lodge colors combined in the making with emblems or initials colored on the texture.  Two pieces of felt, each 1-1/4 in. wide and 4-1/4 in. long, are cut V-shaped on one end of each piece about 1 in. in depth, and 3/8 in. in from the other end of one piece cut a slit 1/2 in. long; the end of the other piece is folded over, making a lap of about 1 in., and a slit is cut through the double thickness to match the one cut in the first piece.  The desired emblem, initial, or pennant is stenciled on the outside of the folded piece with class, college or lodge colors.  The strap is made from a strip of felt 3/16 in. wide and 8-1/4 in. long; stitched on both edges for appearance.  Make a hole with a punch 1-1/4 in. from one end, and two holes in the other, one about 1 in. and the other 2-3/4 in. from the end.  Purchase a 1/2-in. buckle from a harness maker and you will have all the parts necessary for the fob.  Assemble as shown in the sketch.  The end of the strap having the two holes is put through the slots cut in the wide pieces and the tongue of the buckle is run through both holes.  The other end is passed through the ring of the watch and fastened in the buckle as in an ordinary belt. —­Contributed by C. D. Luther.  Ironwood.  Mich.

** Drill Lubricant [223]

A good lubricant for drilling is made by dissolving 3/4 to 1 lb. of sal-soda in one pailful of water.

** New Way to Remove a Bottle Stopper [224]

Take a bottle of liquid, something that is carbonated, and with the aid of a napkin form a pad which is applied

[Illustration:  Removing the Stopper]

to the lower end of the bottle.  Strike hard with repeated blows against the solid surface of a wall, as shown in the sketch, and the cork will be driven out, sometimes with so much force that a part of the liquid comes with it and deluges the spectators, if desired by the operator.