TEE WORLD'S ADVANCE 



77 



The 'Spirit Shadow" Illusion 



The effect of the spirit shadow illusion, 

 as it is called, is secured by means of a 

 darkened stage on which a brightly 

 lighted platform on wheels is placed. 

 The front end of the platform is covered 

 with a curtain which works in a frame, 

 the frame being set at right angles to 

 the platform. Bright lights are at the 

 back of the frame. The illusion is made 

 possible by a trick of optics. The lighted 

 curtain dazzles the audience. Between 

 the curtain and the lights, figures per- 

 form various antics, and their silhouettes 

 are thrown sharply on the screen. 



Contributed by 



HANDY MAN. 



For Bending Wire 



A simple wire-bending machine can 

 be made by drilling holes into a plate of 

 iron or steel and driving pins into them. 



These pins should be spaced according 

 to the size of the wire. Should more 

 than one turn be required, a number of 

 such pins can be made, the length of suc- 

 ceeding pins being greater in order to 

 allow the wire stock to be raised to clear 

 the pins used for the bending operations 

 following. 



Contributed by 



WM. HALK. 



To Bend Tubes Without Kinking 



Tubes can be bent into any desired 

 shape without kinking if the tube is 

 previously filled with fine sand. After 

 the bends are made, the sand can be 

 easily poured out again. 



Contributed by 



EMERSON SMITH. 



