Popular Science Mojithlj/ 



4(i 



3^ in. thick, and J-g in. wide. A ,'4-in. 

 hole was bored through this from end to 

 end above the center or middle line. 

 A pair of links of thin metal on each side 

 were attached by pivot pins at the ends 

 to the sides of the block, and afterwards 

 one end of each link was detached and 

 the block sawed through along the bore, 

 after which the block was placed on the 

 round bolt, which connected the two 

 grooxed puilev's, and the ends of the 

 links again attached. 



By this arrangement the two parts of 

 the block move back and forth a limited 

 distance independently of each other, 

 and in doing so clamp the belt between 

 them. A triangularly-formed stop was 

 attached to the upper member of the 

 block, so that one edge projected down 

 alongside one of the links, and thus 

 limited the movements of the blocks 

 relative to each other. The dotted lines 

 show the swing of the links when the 

 lower part of the block is drawn to the 

 left. 



To move the lower part of this block 

 to the left, and thus grip the belt, 

 attach a cross-piece by nailing to the 

 lower ends of the table legs. The upper 

 end of this arm is connected with the 

 block by a link which is made of 3'8-'n- 

 telegraph wire. A coiled spring with 

 one end attached to the arm and the 

 other to the table leg, serv-es to draw 

 the upper end of the arm back, when it 

 is released bv the foot. 



The dead center was fi.xed to a block 

 similar in all respects to the first block 

 and is secured to the top of the table 

 by screws so it can be moved to and from 

 the block. A rest bar with a series of 

 holes was adjustably attached to the 

 lower sides of the blocks by bolts so if 

 might be moved to or from the lathe 

 centers. The square end of the mandrel, 

 if dri\'cn into a round 5/i6-iii.-hole in 

 the end of the piece to be turned, holds 

 it firmly, and this method of attaching 

 the work obviates the necessity of having 

 thrust bearings for the mandrel and 

 dead center. — J. S. Zerbe. 



A Bottle Pocket Lamp 



A SIMPLE and safe pocket lamp that 

 will last for about si.x months with- 

 out extra cost can be made at home. 



Have the druggist take a strong vial 

 of clear glass, or a pill bottle with screw 

 or cork top, and put into it a piece of 

 phosphorus about the size of a pea and 

 fill the bottle one-third full of pure 

 olive oil which has been heated for 

 fifteen minutes. Care should be taken 

 not to boil it. Cork tightly, and the 

 result will be a luminous light in the 

 upper portion of the bottle. If the 

 light becomes dim, uncork and recork 

 again. The lamp will retain its bril- 

 liancy for about six months, and there 

 is no element of danger in connection 

 with it. — A. V. BOLLERER. 



The Method of Attaching the Work Which Is Indicated 



Here Obviates the Necessity for Having Thrust Bearings 



for the Mandrel and Dead Center 



GROOVED PULLEY "^ 



WHEEL UNK 



LINK 



-BLOCK 



LINK 



