438 



THE INDIA RUBBER WORLD 



March 1, 1921 



A RUBBER-SHOD WINDOW CATCH 



Almost a necessity in these days of burglaries and petty thiev- 

 ing is the "Burg-La-Proof" window catch which automatically 

 locks any window, open or shut. 

 This clever device tits over the top of the lower sash and is 

 attached by tightening a screw which 

 makes it lit securely on any width of 

 sash. An automatic spring-controlled 

 binding lever has a rubber tip se- 

 curely vulcanized over the bent por- 

 tion of the steel lever which engages 

 the upper sash so that forcing win- 

 dows only locks them more securely. 

 The rubber tip prevents injury to 

 the woodwork and holds with a tight 

 grip. 



By using this catch, windows can 

 be left open for ventilation witnout 

 fear of them being opened by thieves 

 or by venturesome children. It pro- 

 vides R factor of safety in the home 

 "Burg-La-Froof"' Window incommensurate with the small cost 

 ^^" of the article. No tools are required 



for installing this device, the slot of the fastening-screw being of 

 sufficient width to accommodate a coin, case-knife or key, if a 

 screw-driver is not available. This catch is made in two sizes, 

 regular and large. — Burg-La-Proof Window Catch Manufactur- 

 ing Co., Everett, Massachusetts. 



FOUNTAIN PEN WITHOUT INK SAC 



The newest type of fountain pen lias been devised without the 

 usual ink sac. Instead there is a "little red pump handle" that 

 does away with side levers, compression rods, and rubber sacs, 

 and operates, as its name indicates, on the principle of the good 



CONSTRl'CTION OF THE DuNN-PenN 



old-fashioned pump. As a result, the barrel of this pen will hold 

 considerably more ink than the ordinary fountain pen. At the 

 same time, the usual claims are made as to its being non-leakable 

 and self-cleaning. Besides the gold pen, there are only four other 

 simple parts, all of which are made of hard rubber. A portion 

 of the pen here pictured is cut away to show the pump. — Dunn- 

 Pen Co., 709 Si.xth avenue, New York City. 



DOUBLE DISK WHEEL WITH FIRESTONE TIRE RIM 



The trim appearance of a motor car equipped with disk wheels 

 appeals to many an owner and prospective purchaser. One of 

 the pioneers in this line is the "Indestructible' pressed steel, 

 double disk wheel, which has been 

 developed through eleven years of 

 experimentation by its manufacturer. 

 Its method of construction insures 

 maximum strength with minimum 

 weight. Road shock is taken up and 

 dissipated through the entire circum- 

 ference of the wheel as the circular 

 triangle bracing principle of the 

 sheets in the wheel counteracts and 

 absorbs these forces. The disks are 

 flanged with long flanges which are 

 riveted to the felloe band, each supporting and strengthening 

 the other. The "Indestructible" wheel provides for the use of 

 the standard Firestone demountable rim. The valve stem in this 



Inside View, "Indestruc- 

 tible" Double Disk 

 Wheel 



wheel comes through at the back of both sheets and is in an in- 

 dentation in the sheet so that the inflating nozzle can be applied 

 easily. Owing to the symmetrical lines this wheel is very easy to 

 keep clean. — Indestructible Wheel Co., Lebanon, Indiana. 



"Fressurel.^stic' In.ner Tlbe 



NOVEL BRITISH INNER TUBE 

 A puncture proof inner tube with novel features is a recent 

 British invention. It is much smaller than the inside of the cover 

 and is expanded to fit by a pressure of 30 pounds to the square 



mch. The walls of the tube are 

 considerably thickened to resist the 

 strain, and the tube takes much of 

 the pressure that usually is carried 

 by the cover. It is claimed that 

 the working pressure of the cover 

 used with this tube is only 55 

 pounds, whereas the usual average 

 is computed at 75 pounds. With 

 the tube inflated by 30 imiuids pressure only 25 pounds is left for 

 the cover to sustain. 



The extra thickness of the Pressurelastic tube makes it some- 

 what heavier than the ordinary tube, but it is practically immune 

 from puncture, does not creep, and cannot be nipped when being 

 fitted into the cover. It is said that extensive tests have proved 

 the advantages of this new tube and that it is in large demand 

 by taxi drivers. — Pressurelastic Inner Tube Co., 27 Colonnade, 

 Russell-square, London, W. C. 



EXTENSION ACCELERATOR PAD AND HEEL REST 



The well-known Rives ^'' 



"Neverslip" auto pedal 

 pads with which a large 

 percentage of American- 

 built automobiles are 

 equipped are now made 

 in an adjustable heel rest 

 combination, as shown 

 in the illustration. The 

 adjustable feature per- 

 mits accommodation to 

 any size desired and thus 



ensures full control of the accelerator without discomfort. — 

 George H. Rives, Manufacturing Co.. Inc.. 2187 \\'oolworth Build- 

 in? New York Citv. 



"Neverslip" Pedal Pad 



HOLLOW BRICK PRINCIPLE APPLIED TO TIRES 



The ceaseless endeavors of inventors to perfect a device that 

 will supersede pneumatic rubber tires brings out daily a number 



of clever ideas. One which 

 seems worthy of note is 

 the "Triangle" tire core, 

 molded of soft rubber 

 with triangular open por- 

 tions so arranged as to 

 displace in cross-section 

 an equal amount of rubber 

 throughout the circumfer- 

 ence of the core. The tri- 

 angle is said to be the only 

 known geometrical device 

 that can accomplish this. 

 The maker of this airless 

 tube guarantees the "Tri- 

 Tr.anole Tire Core ^ngle" tire core to ride 



more easily than air, to supply a much greater resiliency, and to 

 make accidents from blowouts impossible.— Triangle Tire Core 

 Co., 1209 Grand avenue, Des Moines, Iowa. 



