128 



Popular Science Monthly 



that we are working in outlines almost 

 exclusively, although occasionally some 

 suggestion of translucency may be intro- 

 duced with good effect. Excellent "still 

 life" studies may be made from flowers and 

 foliage arranged in clear, cut-glass bowls or 

 vases. Obviously, there is a wide choice 

 of subjects, but heavily opaque objects, 

 without beauty of outline to recommend 

 them, should be strictly avoided. 



The question of printing out these 

 shadow photographs effectively must be 

 left to personal decision. Sensitized papers 

 are obtainable nowadays in so many 

 varities of tint and surface-texture that the 

 most exacting requirements can usually be 

 met. If the object in view is a close imita- 

 tion of a real silhouette, it may be gained 

 by using a smooth-surface bromide paper 

 which gives strongly contrasted black and 

 white effects. — Percy Collins. 



To Sharpen Skate -Runners 

 with a File 



THE following is a good way to sharpen 

 steel skates having soft runners. Take 

 two pieces of soft wood, about 2)^2 ii^- long 

 and I in. square and fasten them securely 

 I in. apart on a workbench or table as 

 shown. Secure another piece lo in. long, 

 3 in. wide and i in. thick, to the bench-top 

 about 6 in. from the first pieces. Clamp 

 the»skates to these cleats the same as you 

 would on the soles of the shoes, and 



Clamping skates to a bench-top to hold 

 r them securely for filing the runner surfaces 



sharpen them with a lo-in. file. File in 

 one direction only, to keep from spoiling 

 the file-teeth. This method is quick, and 

 a much better edge can be obtained by it 

 than by grinding. — George Wasserberger. 



Repairing the Torque-Rod Support 

 on an Automobile 



THE drawing illustrates how the forward 

 end of an automobile torque-rod is 

 supported. Trouble was experienced at 

 this point on a rather low-priced car, and 

 after examination it was found that the 

 parts were badly worn. 

 The plungers A , placed on 

 both sides of the ball-end 

 of the radius-rod, were case- 

 hardened to avoid being 

 worn quickly from the ac- 

 tion of the ball-end. The 

 support-casing, however, 

 was made of cast-iron. This 

 being compara- 

 tively softer 

 than the hard- 

 ened plungers, 

 wore a great deal 

 more rapidly. 

 Thus an unnec- 

 essary clearance between 

 the plungers and casing 

 was made which was found 

 to be 3^8 in. at some points, 

 and this was the cause 

 of the trouble. 



To eliminate it the 

 entire assembly was removed from the car 

 and the casing rebored to a somewhat larger 

 diameter. To allow for this increase, 

 bronze bushings were pressed over the 

 plungers as shown. This repair eliminated 

 the trouble, and gave the added advantage 

 of causing the wear to be carried by the 

 bushings, which could be readily and 

 cheaply replaced. — Adolph Klein. 



TORQUE. ROD ' 

 BRONZL BUSHING. 



Bushing the 

 sliding parts of 

 a torque-rod 



Repairing Molded Rubber Goods 

 with Quick- Cure Cement 



THE quick-cure vulcanizing cement is 

 excellently adapted for repairing 

 molded goods and other rubber articles 

 which would not stand prolonged exposure 

 to the heat of vulcanization. Hot- water 

 bottles, rubber boots, bands on date 

 stamps, etc;, are examples of articles that 

 can be repaired with this cement. 



A Ground Color for Applying 

 Mahogany Stain 



DISSOLVE permanganate of potash in 

 sufficient water to make a rich crimson 

 shade. Any kind of white wood may be 

 painted with this solution. When dry, 

 apply the mahogany stain and finish in 

 the usual manner. 



