Page:Popular Science Monthly Volume 88.djvu/637

 Popular Science Monthly

��609

��Attaching an Index Plate

BY the following plan, an index plate can be attached to a hollow spindle lathe which has no convenient place for attachment.

The spindle, A, to hold the plate, is ,lndej( plo^e

���Expond/nQ bo/t A convenient method of attaching an index plate to a hollow spindle lathe

turned to fit the bone of the lathe spindle and has a y^'' hole drilled through the center. One end is tapered and split to receive the tapered bolt B. The plate should have two pins riveted to it to fit the holes in the spindle end. The bar D and the arm E are made according to the design of the lathe. — A. H. Johnson.

A Candle Motor AN interesting and^ novel form of l\. motor can be made from two ordi- nary tallow candles. When properly made, the motor will have a rocking or seesaw motion due entirely to the melt- ing of the burning candles.

���As the illustration shows, the device consists of a cardboard tube having an inside diameter to receive the candles snugly. The tube is hung on an axle in the center of a wooden stand or bear- ing made of three simple pieces of wood, as shown. The tube should be fairly well balanced. Candles are then in- serted in the ends, also well balanced. If one end proves heavier than the other, light the candle at the heavy end, and allow the tallow to melt until that end rises; then light the other candle. The alternate dripping from the two candles will cause the tube to rock back and forth like a walking-beam. It will keep going until the candles are entirely con- sumed. — Charles I. Reid.

An Emergency Vise Repair

HAVING broken the threaded shaft of a 3'' vsei it cao be repaired as follows :

Take two pieces of brass 2" by %" by %" and in the center of each piece bore and tap a hole to admit an 8-32 thread.

���The lower candle burns faster than the

upper, and, becoming lighter, is raised.

The seesaw motion continues, therefore,

as long as the candles last

��A vise repair which can be made quickly in case of an emergency

A threaded brass rod 6'^ long, two knurled nuts and a knurled 8-32 nut about %" in diameter are the other ma- terials needed.

The various parts are assembled as shown in the diagram. The brass bars are marked A, the threaded rod, B, the small knurled nuts. C, and the large nut, Z).— T. \\\ B. Best.

A Trick in Sawing AMATEUR carpenters often have x\. dilt'iculty in sawing a square cut. If when starting to saw they will hold the saw so that the reflection of the work extends in a straight line, there will be no difficulty in sawing the wood at right angles with the edge.

�� �