THE INDIA RUBBER WORLD 



[April 1. 1916. 



in tlie side wall. This permits a uniform escape cif air which 

 gives an even yield and recovery. Both sides of this mat are 

 alike, so that it may lie reversed and thus give douhle service. 

 [Bowers Ridi1)er Works. San Francisco, California.] 



STAIR TREAD WITH RUBBER STUDS. 



In the stair tread here illustrated, interchangcalile studs 

 molded of tough, dark grey rubber, in a new design, lit into th( 

 grey-white, non-corrosive, cast metal plate wliicli forms the boil; 

 of the tread. 

 The studs are 

 easily fitted by 

 simply screwing 

 down and are 

 arranged in la- 

 teral rows, fa- 

 cilitating the operation of cleaning or sweeping. When the 

 center studs are worn down, and this it is claimed does not 

 occur until after considerable usage, it is a simple matter to re- 

 arrange them by the use of a screw-driver. When the treads 

 are fastened on the stair an empty space is left behind the rear 

 edge which may be tilled with rubber matting, if desired. [The 

 Reliance Rubber & Harwood Co., London, England.] 



THE 'TESTOID • RADIATOR HOSE. 



In the radiator hose here illustrated the manufacturer claims 

 to have secured a motor hose that will not harden, soften, crack 

 or collapse, or be in any way afifected by the heat generated from 



the motor. It 

 is also guar- 

 a n t e e d to 

 w i t h s t and 

 the action of 

 oil, hot or 

 cold water, 

 and a n t i - 

 freezing solutions. The cover is black, and the tube, cover and 

 friction are all thoroughly tested compounds. The hose is fur- 

 nished in either two-ply or three-ply duck, with plain or capped 

 ends, or capped ends beveled ; also with enlarged or tapered end, 

 if desired. A similar variety of hose, called the "Thermoid," has 

 a white cover. 



The hose is packed according to a new system which is said 

 to find favor with dealers. Six pieces, three feet long, each 

 piece of a different diameter, or all of the same diameter, are 

 packed in a box. The six largest selling sizes of hose are 1^, 

 1^, IK. 2 and 2!4 inches, respectively, these sizes making a con- 

 venient assortment for a box. [Thermoid Rubber Co., Trenton, 

 New Jersey.] 



^^ 



THE "ROYAL- SPARK-PLUG TESTER. 



The "Royal" tester for spark plugs on automobiles, motorboats, 

 notorcycles, etc., consists of a crotch containing the spark gap 



and two legs 

 containing the 

 terminals. One 

 leg is three 

 inches longer 

 than the other, 

 facilitating con- 

 tact. The tester 



will show the regular spark w^hen the plug is good, and if it is 

 short-circuited there will be no spark. An irregular spark will 

 indicate defective porcelain; a clear spark, lack of power in the 

 motor. This convenient accessory is covered with hard rubber. 

 [Pittsburgh Electric Specialties Co., Pittsburgh, Pennsylvania.] 



GEAR GUIDE-MAT. 



Owing to the number of dififerent gca 

 cars, the unaccustomed driver 

 frequently has difficulty in rinding 

 the right gear. In a 1916 model 

 car all doubt and hesitancy is 

 eliminated by the simple ex- 

 pedient of marking the gear 

 positions in large, clear letters 

 on the rubber mat in the 

 driver's compartment, as shown 

 in the accompanying illustration, 

 Ohio.] 



[Grant Motor Co., Findlay, 



A FLEXIBLE RADIATOR SUPPORT. 



.\ novel feature of the Menominee truck is the radiator sup- 

 pi irt. which forms a flex.lile joint between the chassis and 

 radiator. A hollow rubber ball encased in each connection, 



guards the radiator against road shocks, vibration and all warp- 

 ing stresses. The device is protected against dirt and grit, and 

 the brackets carrying the head lamps are also supported on this 

 pneumatic shock absorber. | D. F. Poynter Co., Menominee, 

 Michigan.] 



THE TURNER AVIAPHONE. 



Noiseless flying maciiines have still to be invented. The pro- 

 peller and motor of flying craft, in its present state, create so 

 much noise that a pilot and passenger cannot hear each other 

 speak. This difficulty 

 has finally been over- 

 come by the invention 

 and perfection of an in- 

 strument called the 

 "Turner Aviaphone." A 

 rubber face mask with an 

 aluminum mouthpiece, 

 connecting with the 

 breastplate transmitter 

 by means of a hard rub- 

 ber tube, is used only 

 during conversation. 

 There are two helmets, 

 or caps, two specially 

 w o u n d receivers for 

 each user, connecting 

 cords, battery, plugs and 

 jacks; the entire outfit 

 weighing only 5 pounds 

 5 ounces. Caps, as shown in the illustration, are furnished but 

 the receivers can be adjusted to any type or size of headgear. 

 This instrument is of especial value to army and navy aviation 

 corps, as it leaves the hands entirely free. [General Acoustic 

 Co., X'ew York City.] 



