^KiTEMMER I, 1916.J 



THE INDIA RUBBER WORLD 



671 



THE DOUBLE SERVICE NON-INFT-ATABLE TUBE. 



•. substitute tor air in pneumatic tires which will retain all the 

 I iiliency (lisplacemciit and easy riding qualities of compressed 

 air is offered by the makers of the "airless" tube. 



This is made in an arch shape similar to a tire design and tits 

 the inside of the tire perfectly — being inserted exactly like an 

 ordinary tube. It is built of specially compounded springy rub- 

 ber and fabric of a thickness that will retain the weight of a car 

 and its load and permits of deflation or displacement whenever 

 an object is struck or passed over. Its action is therefore the 

 same as the ordinary pneumatic tire when in use. This tube 

 requires no inflation, and as it only contains ordinary atmospheric 

 pressure of 18 degrees, there cannot be punctures or blow-outs. 



The illustration shows the tube action when passing over an 



object. There is a displacement of air and rubber exactly the 

 same as a pneumatic tire w-hich prevents vibration or bouncing 

 and results in easy riding qualities. [The Double Service Tire 

 & Rubber Co.. .Akron. Ohio.) 



THE KAHN VALVE. 



This new departure in tire valves combines a pressure gage 

 and valve that in outward appearance is similar in size and 

 shape to the ordinary inner tube valve. A novel feature is, thai 

 it can be set to the desired pressure and when 

 that point is reached the unnecessary air i.s 

 diverted through an outside port producing a 

 whistling noise that serves as a warning. Re- 

 ferring to the illustration, the collar C is turned 

 until a projection slips into one of the five slots 

 marked 50, 60, 70, 80 and 90 pounds. The air is 

 then turned on and when the point at which the 

 valve has been set is reached, a check valve 

 closes, due to the opening of the blow-off valve 

 E, thus relieving the air pressure from the out- 

 side and allowing the pressure in the tire to close 

 the inner check valve. All air now coming from 

 tlie pump passes outside through the port G, with 

 a whistling sound. 



It is impossible to put more air intn the lire 

 than the pressure to which the valve has been 

 -ft, as the area of the port G is greater than that 

 I the inlet valve. The reason air does not 

 c-cape through these ports before the desired 

 .(•rf-sure is reached is due to the pressure of a 

 -I'riii'T tliat acts on the blow-oflf valve and closes 

 tiK ports until the pressure becomes greater than 

 itiat of the spring. 



Should it be desired to verify the tire pressure, the collar C 

 is set at 80 and the top of the valve is pressed down. If the 

 valve does not whistle it indicates that there is less than 80 

 pounds pressure. With the collar C set back to 70 pounds and 

 the operation repeated, if the valve whistles it will indicate that 

 the pressure is over 70 pounds. If it does not whistle at 70 the 

 collar C is set back to 60 pounds and the operation repeated until 

 the pressure in the tire is indicated. [Armstrong Rubber Co., 

 - .,- New York Citv.l 



A DEPENDABLE AIR BAG. 



The tire repair air ba;; is a very useful accessory tliat usually 

 ?ceives scant attention until the time comes for the accomplish- 

 icnt of its important part in rrpair operations. Then it 



is resurrected 

 from under- 

 neath the bench 

 in a more or 

 less neglected 

 condition and 

 e .\ p e c t e d to 

 faithfully fulfil 



its duty. .All air bags should be well made and well taken care 

 of, that good service and reliable repairs shall be the result. The 

 illustration shows one that is specially constructed in a manner 

 to fulfil the peculiar duties of an air bag. 



According to the maker, the lining and frictioned fabric are 

 made with a special non-blooming rubber compound that will 

 withstand several hundred vulcanizations without losing its use- 

 fulness. Strength has been considered by using sufficient plies 

 of the best cotton duck in the body and the entire bag is con- 

 structed with the idea that first cost is considered subordinate to 

 satisfactory service. [The American Rublier & Tire Co., .\kron, 

 Ohio.] 



HOOD AND PURITAN TIRES. 



The "Hood" and "Puritan" tires are claiming serious attention 

 from motorists who are interested in obtaining results in mileage 

 and freedom from tire troubles. The claim of the makers is 

 that they are manufactured primarily to excel 

 in quality and length of service, as a marked 

 distinction from cheap and unguaranteed tires. 

 Among the points of superiority claimed 

 for "Hood" tires may be mentioned that they 

 are made with an extra ply of fabric, having 

 on the small sizes one more, and on the larger, 

 two more plies than the standard priced tire; 

 the best quality of Egyptian fabric is used, 

 every roll being tested before it is fric- 

 ^ tioned; the rubber is care 

 fully selected from first qual 

 ity Plantation and Para, and 

 claimed to be compounded 

 only with sulphur ; the beads 

 are locked in, and constructec 

 to prevent rim cutting, whib 

 the cushion and breaker -ti i; 

 are made unusually widi , 

 .\rro\v Tread. ing the tire extra stren-i 

 the depressed type tread is extra wide, .if 

 made of tough stock, and the arrow-shai . 

 non-skid depressions have very sharp e.! 

 that hold the road by suction. 



The unusually long mileage obtained f 



these tires makes the cost per mile of the iiu 

 very low, although the first cost is higher than 

 that of the standard tire because of the extra 

 construction. This may be seen from the fact 

 that, during 1915, the loss on the tires which 

 came back to the factory for adjustment, on the 

 basis of 5,000 miles, was less than one-half of 

 one per cent. 



They are made for every size and style of 

 rim, in clincher, quick detachable and straight 

 side types. [Hood Rubber Co., Watertown. Massachusetts. 



Replete with information for rubber manufacturers.— Mr. 

 Pearson's "Crude Rubber and Comiioundin.-i Insredients." 



