224 



THE WORLD'S ADVANCE 



been made for that many numbers). The 

 other columns should be headed by other 

 commonly used factors, which should be 

 multiplied by consecutive numbers and 

 placed on the sheet in their order. 

 Contributed by 



H. JOHN GRAY. 



A Home-Made Table Lamp 



A little experience in forging and lathe 

 work is necessary in order to construct 

 the student's table lamp illustrated in the 

 drawings which accompany this article. 



The completed lamp is shown in Fig. 

 i ; the casting for the base, in Fig. 2, and 

 the adjustable socket for regulating the 

 light, in Fig. 3. 



The base may be cast of brass, iron or 

 aluminum in the desired proportions. A 

 pipe of any desired length connects the 



base to the adjusting clamp and socket. 

 This pipe should, of course, be hollow 

 to admit the passage of lamp cord. Re- 

 ferring to Fig. 3, the tube from the base 

 is screwed into a small culvert running 

 through a round casting and terminating 

 in a flaring opening. The socket, rounded 

 as shown, fits into this opening. A 

 smaller tube connects the socket to the 

 lamp socket. 



Regulation of the lamp stand is had by 

 loosening and retightening winged nuts 

 which clamp a metal covering tightly 

 over the socket. 



Contributed by 



G. W. JAGER. 



An Emergency Ruby Lamp 



A makeshift ruby lamp for photog- 

 raphy can be made by wrapping several 

 thicknesses of Japanese ruby tissue paper 

 about an electric light bulb and held se- 

 curely in place by several rubber bands. 

 Several thicknesses of paper should be 

 used to guard against pin-holes. 



Contributed by 



H. W. PRATT. 



Dustless Window Cleaner 



A dustless window cleaner can be 

 made by filling a linen bag with 

 powdered chalk. When the cleaner is 

 used, the bag should be dipped in a bowl 

 of denatured alcohol. When the bag is 

 rubbed over glass a milky surface re- 

 sults. This should be removed by brisk 

 rubbing with a clean cloth. 



Contributed by L. E. FETTER. 



