86 



THE WORLD'S ADVANCE 



Memoranda Holder for the Housewife 



A very handy kitchen memoranda- 

 holder for the busy housewife, on which 

 she may jot down articles to be ordered, 

 is illustrated in the accompanying draw- 

 ing. It requires but three pieces of 

 board, three pieces of tin and a piece of 



wooden or metal rod to hold a roll of 

 paper, such as is used in adding machines, 

 or any other roll of paper that may be 

 obtainable the roll determining the size 

 of the parts for the holder. 



The two side pieces, A, are sawed out 

 alike from J^-inch or 24 -inch stock, 

 clamped together and the holes for the 

 roll shaft bored. Then the top piece, B, 

 with tin strips, C, attached, is fastened to 

 them. Wood or metal discs, D, with a 

 screw-hole off center, should be used to 

 cover the shaft holes so that shaft will 

 stay in place, yet may be swung aside to 

 remove shaft in renewing rolls, E. 



The holder may be attached to the 

 wall by the tin piece, F, which is fast- 

 ened to the back, and a pencil hung close 

 by on a string to be always at hand. 



Contributed by 



ARTHUR A. HORN. 



Temporary Repair for Gasoline Cock 



If the drain cock of a gasoline tank 

 on an automobile is in a leaky condition 

 it can be temporarily repaired by remov- 

 ing the plug key and smoothly wrap- 

 ping several thicknesses of thin tinfoil 



around it. The plug should be pushed 

 in tightly and the washer, spring and 

 cap-screw replaced. 



Contributed by JOHN HOECK. 



Correct Lighting for the Dark Room 



The proper illumination of a photo- 

 graphic dark room should consist of 

 three lights, one of which is white, an- 

 other bright red and the third dim red. 

 These results can be obtained if two 16 

 c.p. lamps, one of clear glass, or frosted, 

 and the other red, are used. A small 

 resistance, R, composed of a length of 

 German silver wire wound upon an as- 

 bestos core, should be inserted in the 

 circuit in which the red lamp, A, is con- 

 nected. A single-throw single-pole knife 

 switch, SW ' , should be shunted across 

 this resistance coil so that the intensity 

 of the light can be quickly changed from 

 brightness to dimness. Current from M 

 flows through the double throw double 

 pole knife switch, which is indicated as 

 DP DT SW in the drawing, into either 



R 



pwvw 



the red lamp circuit or the white lamp 

 circuit, as desired. 

 Contributed by 



J. QUINCY HOLMES. 



A Lubricant Chart for the Machine 

 Shop 



Various types of machinery require 

 different grades of oil for their correct 

 lubrication. This important fact is often 

 disregarded in many of the most up-to- 

 date machine shops. A chart of lubri- 

 cants, which has been carefully worked 

 out from experiments covering a long 

 period, appears on the facing page. If 



