298 



Popular Science Montlily 



Hoisting Timbers Rapidly 



At the left is shown the usual way of 



hoisting logs. At the right may be seen 



a new arrangement which saves power 



SEVERAL thousand cedar poles can be 

 removed from a river and deposited 

 on flat cars alongside by means of an 

 ordinary "stiff-leg" derrick with a hinged 

 boom. Instead of setting the mast 

 vertical, the top should be inclined 

 about i8 ins. toward the river, its height 

 being about 50 ft. 



Instead of attaching the snatch-block 

 for the hoisting cable to the foot of the 

 mast, anchor it about 18 ins. from the 

 foot of the mast, on the land side. In 

 this way the boom is swung around by 

 the cable when the load is lifted, and 

 when the load is dropped the leaning 

 mast causes the empty boom to return 

 over the water, thus making it automatic 

 each way through 180 degrees. By the 

 observance of such a simple expedient as 

 tilting the mast, a great deal of labor is 

 saved. — J. L. Baylev. 



With this newly arranged derrick large 

 quantities of logs can be raised from a river 

 and deposited on flat cars in a short time 



An Adjustable Tap Wrench 



ONE of 

 tap V 



A serviceable wrench 



the best 

 ip wrenches 

 to be had can be 

 made in a few min- 

 utes by anyone following these directions: 

 Cut a piece of J g-'nch sq. tool steel 10 

 ins. long, exactly in the middle, lea^•ing 

 two 5-inch pieces. Lay these pieces 

 over each other a distance of i J/2 ins.; 

 clamp the lapped ends in a vise and ^^ 

 in. from each end of the lap, drill a No. 

 8 hole through the lap. In one piece 

 tap the holes with a 14-24 tap, and re- 

 drill the holes in the other piece with a 



^-inch drill. LIse two 14-24 cap screws 



I m. long, and file the threads off a 

 distance of ?^ in. from the head. Put 

 \'Our two pieces together and mark off 

 the exact center of the lap, then file a 

 Y-shaped slot 3-32 in. deep in each 

 piece, to hold the tap. 



Round off the handles with a file and 

 emery cloth and, if desired, the wrench 

 may be hardened to a blue steel finish. 

 This wrench will take anything up to a 

 3/^-inch tap. For a larger and stronger 

 wrench, use heavier stock and longer 

 handles. — L. E. Fetter. 



Three Oil-Proof Lutes 



ONE of the best known oil-proof lutes 

 contains the following ingredients: 



Good glue 2 parts by weight 



Glycerine I part b\' weight 



Water 7 parts by weight 



First soften the glue with the water; 

 then melt and add the glycerine. This 

 is a good lute for rendering corks 

 vacuum-tight, and for stopping small 

 leaks of almost an\tiiing except water 

 and steam. 



A lute suital)lc for use in laboratories 

 and plants handling o\\ \apors is a putty 

 made of molasses and llour. 



Another useful and very satisfactory 

 oil-proof lute contains the following 

 sul)stanri's: 



Glycerine 90 parts by volume 



Water 10 parts by volume 



Those ingredients arc to be made into 

 a stiff putty with the following: 



Litharge ()o parts l)y weight 



Red lead 10 parts by weight 



This mixture takes several hours to 

 stiffen and about a day to set. 



