^l Mil 



FOR PRACTICAL 

 WORKERS 



fife 



iImT - 



Flaps Used on Inner Tubes to 

 Prevent Pinches 



TIRE users do not generally realize the 

 purpose of flaps and their influence 

 in relation to the tire service. It is 

 not customary to use flaps with clincher 

 tires, not because it is unnecessary, but 

 because of the difficulty in using a flap and 

 stretching the tire on the rim so that it 

 will fit properly. The beads of this type of 

 tire are stretchable and are made approx- 

 imately one inch less in diameter than the 

 diameter of the rim, the object being to 

 cause the tire to fit snugly to the rim, after 

 being applied. 



Several years ago it was a practice to use 

 rim strips — a strip of fabric stretched 

 tightly on the rim. These strips caused 

 the beads to fit very snugly to clinches of 

 the rim and protected the tube from rust 

 and other damage. This was discontinued 

 some time ago. While it is not necessary 

 to use flaps with clincher tires of small 

 size, it is really the proper thing to do with 

 this type in sizes above 4 in., unless clips 

 or spreaders are used to hold the beads 

 tightly in the clinches of the rim so that 

 the inner tubes will not be pinched or 

 damaged. The beads of the quick detach- 

 able clincher cases and cables of straight 

 side cases are non-stretchable and are, 

 therefore, made to the approximate diam- 

 eter of the rim. 



In former years tire manufacturers ce- 

 mented the flaps to one side of the cases. 

 The heat of the tire caused the flap to 

 loosen, slip out of position, work under the 

 beads, wrinkle and chafe the tubes. The 

 floating flap, i. e., the flap loose in the case, 

 proved to be more efficient in many re- 

 spects. It is easier to apply the tire to the 

 rim, the flap adjusts itself to suit conditions 

 and, with reasonable caution, it is an easy 

 matter to apply the tire so that the flap 

 will stay in its correct position. The loose 

 endless flap was then improved by splitting, 



notching the ends in such a manner as to 

 make the flap adjustable in circum- 

 ference to accommodate variations in the 

 circumference of the tire. 



A Window Ventilator Which 

 Eliminates Drafts 



IT is often inconvenient or unwise to open 

 a window from the bottom for ventila- 

 tion, on account of the disagreeable draft 

 created. The illustration shows a simple 

 method of eliminating the draft while still 

 securing a plentiful supply of air. It is 

 especially recommended for the sick-room 

 or for a bedroom. 



For each window, cut two pieces of 24-in. 

 board as shown. These should be mounted 



A glass set on a slope to direct the air cur- 

 refits upward as they enter the room 



on either side of the window and fastened 

 to the casement or sill. A groove at 60 deg. 

 angle is cut in the board for inserting a 

 piece of glass, the length of the window and 

 about 6^2 i n - high. This allows the air to 

 enter the room at an upward slant instead 

 of directly. — J. C. Grindell. 



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