THE WORLD'S ADVANCE 



359 



Acid Pyrography 



Artistic designs can be burned in 

 wooden surfaces by the use of an acid 

 solution formulated properly with equal- 

 ly as good results as are obtained with 

 the pyrographic needle. 



A 20 per cent, solution of sulphuric 

 acid should be mixed in an ordinary ink 

 bottle, and the liquid tinted with red ink 

 or other coloring matter, so that the acid 

 line will be visible when it is applied. 



After the design has been printed or 

 drawn on the wood surface, a tailor's 

 iron should be rubbed carefully over it 

 until the desired shade is obtained. The 

 acid should be painted over the design 

 with a small camel's hair brush. 



Contributed by 



J. BRAFF. 



Pole Testing Paper 



Pole testing paper can be prepared by 

 soaking thin blotting paper in a starch 

 solution ; when it is dried and cut into 

 strips, it should be immersed in a solu- 

 tion composed of ~*/2 ounce of potassium 

 iodide in I pint of water. The polarity 

 of a current is determined by placing 

 two wires y 2 inch apart on a sensitized 

 strip. The positive pole will be indi- 

 cated by a violet covering. 



Contributed by G. W. GREENE. 



Combination Ice Chipper and Broom 



A combined broom and ice chipping 

 tool will save time in cleaning the snow 

 and ice from walks in the winter. The 

 chipping tool should be removed from its 

 original handle, driven on to the broom 

 handle and held in place with wood 

 screws. 



Contributed by G. G. GUNKLE. 



A Tennis Court Scraper 



A serviceable tennis court scraper can 

 be made in the shape of a krge hoe. A 

 wooden rod 2 inches in diameter should 

 be sawed down the center and a thin 

 strip of steel clamped between the faces 

 of these two halves so that it projects 

 about two inches from one side. In the 

 center of the rod and at right angles to 

 the blade a hole should be bored to fit the 

 end of a long handle. The rod and the 

 handle should be braced as shown. 



Contributed by 



ARTHUR EDGAR. 



A Stove Leg Fastener 



In moving or lifting stoves, the legs 

 often drop out, or become loose. This 

 can be prevented by bending a strip of 

 heavy tin over the top of the leg, to fill 

 the space between the top of the leg and 

 the stove, and fastening the opposite end 

 to some projection on the body of the 

 stove. 



Contributed by 



B. W. VERNE. 



Hanging Hard Wood Shelves 



Instead of the usual wooden pegs for 

 assembling the parts of hardwood 

 shelves, a substitute which will serve the 

 purpose equally as well consists of wire 

 nails driven into one board, the heads 

 filed off, and these protruding ends 

 plugged into holes in the other board. A 



