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. 



