Popular Science Monthly 



783 



A Lead Pencil Sharpener with Dust 

 Collector Box 



THE pointer consists of a box in which 

 a wood cylinder is placed having a 

 diameter almost 

 the same as the 

 box opening is 

 wide. This roller 

 is hung on a 

 shaft, one end of 

 which extends 

 out for a thumb 

 hold. Sand- 

 paper is tacked 

 to the surface of the roller. After pointing 

 the pencil the roller is turned to deposit the 

 dust in the box. — G. P. Lehmann. 



Sandpaper covered rol- 

 ler for pencil sharpener 



A Stain for Giving Wood a Brilliant 

 Rose Color 



WOOD and vegetable ivory can be 

 colored rose-red without much diffi- 

 culty by chemical precipitation. The color 

 resulting from the following baths is very 

 brilliant and uniform. The first bath con- 

 sists of a solution of eight parts of potassium 

 iodide added to a hundred parts of water; 

 the second, two and a half parts of corrosive 

 sublimate to a hundred parts of water. 

 The wood is immersed for a few hours in 

 the first bath, then placed in the second 

 bath, where it acquires a beautiful rose-red 

 color. After drying, it should be varnished. 

 Both baths can be used repeatedly before 

 renewing them. — Herman Neuhaus. 



Repairing a Fast-Pin Hinge Where 

 Riveting Is Impossible 



SOME time ago, having lost the key to 

 my toolbox, I had to file off and with- 

 draw the pins of the hinges to open the 

 box. The hinges themselves were all 



Cut off here 



An ordinary wire nail sharply 

 bent and used for a hinge pin 



riveted on. When I attempted to replace 

 the pins I found it impossible to rivet 

 them, because I could not hit them hard 

 enough to form the rivet. 



I used the box with loose pins until an 

 easy solution occurred to me. This was 

 to take long spikes, slip them through the 

 hinges as far as they would go, and bend 

 them sharply with strong pliers, as shown 

 in the illustration, after which they were 

 cut off half-way on the bend. 



This same method can with advantage 

 be used in cases where it is desired to 

 change a loose-pin butt into a fast-pin one, 

 and where riveting is impracticable. 



Drawing Perspective Views by Mov- 

 ing Paper on Board 



IN the illustration is shown a method of 

 drawing perspective views of machinery, 

 buildings and the like. Instead of using a 

 protractor it is only necessary to remove 

 all the thumb tacks except the one shown 

 at A, which is used as a fulcrum. When 

 the sheet of paper is moved to the desired 



Swing drawing paper on board to get the 

 proper " perspective lines with T-square 



angle of projection, proceed with the T- 

 square and the triangles just as for plain 

 horizontal and vertical lines. After the 

 paper is set to the required angle the thumb 

 tacks are replaced. 



While the paper is still set square with 

 the drawing-board, the border lines should 

 be drawn. The one marked B is used in 

 connection with another marked C on the 

 board for setting the paper, or a protractor 

 may be used direct, if there is one at hand. 

 The general layout should be penciled first. 

 An angle of about 15 or 20 deg. is the 

 greatest that is practicable with this 

 method. — J. B. Murphy. 



