THE WORLD'S ADVANCE 



225 



positions with the aid of a protractor. 

 Contributed by 



FRANK HARAZIM. 



To Cut Large Holes in Fibre 



Large holes can be cut in small-sized 

 fibre pieces by clamping the fibre in a 

 lathe chuck by means of a special holder, 

 as shown. The cutter should be small 

 and thin. 



Contributed by 



JOHN TIMMER. 



To Eemove Surplus Glue 



Surplus glue should not be wiped off 

 while fresh, nor should it be left to dry. 

 In the first case, it lowers the appearance 

 of the work and often prevents stains or 

 varnishes finishing properly. If it is left 

 until dried, it is difficult to remove, and 

 the work may be marred in the effort. 

 The best plan is this : Allow the glue to 

 remain where it is for an hour or two 

 until it becomes jellied; then scrape it off 

 cleanly with a thin knife or chisel. 



Contributed by 



WM C. HOUGHTON. 



Triangle Protractor 



The combination of a triangle and pro- 

 tractor will prove to be a very useful ad- 

 dition to the implements of the drafts- 

 man. The degrees may easily be marked 

 on the surface of an ordinary celluloid 

 triangle, as this material is readily 

 scratched with a sharp point. On the per- 

 pendicular of the triangle, a scale may 

 be marked, thus further enhancing the 

 value of the instrument. The degree 

 markings may be placed in their proper 



Foot Pressure Closes Switch 



A safety switch, closed by the pres- 

 sure of the foot, is illustrated in the 

 accompanying drawing. In case the 

 workman should receive an electric shock 

 the withdrawal of his foot from the ped- 

 al immediately opens the circuit. This 

 suggestion will find valuable application 



in laboratories where high voltage cur- 

 rent experiments are carried on. 

 Contributed by 



FRANK HARAZIM. 



Improved Coat Hanger 



An improvement upon the coat hanger 

 which was described in these columns 



