590 



THE INDIA RUBBER WORLD 



[August 1, 1916. 



site sides at right angles to tlie face of the plate anil these 

 not only serve to stiffen the tnbes, but also act as insulating 

 spacers. Tlie ruhlicr tubes have a certain amount of elasticity, 

 allowing them to compensate for changes in volume of the 

 active material, due to expansion and contraction during charge 

 and discharge. The negative plate consists of gray spongy lead 

 and the top and bottom edges are encased in rubber vulcanized 

 i[i place. This eliminates the possibility of short circuits from 



l'...iliv>.- Plate. J3— Hard Rubl.er Tulies. C—HarJ Rubher Tar. D— 

 llnrd Rubber Vent. 7:— Soft Rubber Plug. F— Hard Rubber Cover, 

 f;— Wood .Separator. H— Positive Plate. /—Hard Rubber 

 Insulator. 



lalerial bridging across from the positive frames. The nega- 

 ve frames are undercut so that the rubber sheathing is flusli 

 lid does not project beyond the surface of the plate. There are 



plates, wliich measure S-J4 by 85^ inches, and the discharge 

 1 amperes for 4}4 hours is 21. The rubber jars are 2^ by 6/k 

 y 12')i inches high and weigh 22^( pounds. 



TIIF. TI. S. H. &• L. BATTERY CKI.I.. 



The positive plate of the U. S. L. type "VVB," .shown in l-'ig. S. 

 . made up cif antimonious lead grids of the staggard bar type. 

 . paste mi.Nturc of oxides forming the active material is forced 

 ltd the cells of the grid under pressure, giving the linisbed 

 late a dark brown color. 



The grid ..f the negative plate is made up <>l an antimnnious 

 L-Mter well with thickened edges to give it strength anil rigidity. 



Rubber Jar. . 

 . '•" — Wood Separators. 



Vent.s or .Jixtensions. H — Negative 

 riate. 7 Negativfe-'Grid. 



forated nickel-plated steel tubes, filled with alternate layers of 

 nickel hydrate and inetallic nickel flake. The negative plate con- 

 tains pockets of perforated steel, holding iron oxide, the nega- 

 tive active material. The four positives are supported on a 

 horizontal rod, forming part of the pole or terminal. They are 

 spaced apart by nickeled steel washers, and clamped firmly by 

 a nut on each end of the rod. The five negatives are similarly 

 mounted on their pole. The two groups are then assembled. In 

 order to support rigidly the edges of the plates, there are placed 

 thereon two hard-rubber "ladders," each of wrhich has grooves 

 into which the plates I'lt. The compact mass is then ready for the 

 can. 



The hard-rubber "stool," or plate support, is then placed in 

 the can bottom, and the grouped elements pushed in. Two 



The active material is aiii)lied under pressure, resulting m a 

 linisbed plate of a slate gray color. 



The bridges in the hard rubber jar have soft niliber tops on 

 which the plates rest. These act as shock-absorbing cushions. 

 The size of the plates is 5.)4 by 85^ inches, and the 7-plate cell 

 will discharge 21 amperes in 4 hours. The jars measure 2^ by 

 6' iJ by 13's inches high, and the cell complete weighs 22'/, pounds. 

 THE EDISO.X Ii.\TTERY CELL. 



The Edison type "A-4" cell consists of four ]iusitive, and four 

 negative plates. (See Fig. 6. > The former are made cf per- 



B- Hard Rubber "Ladders" C— Hard Rub- 

 Kubber Wasbcr. £— Hard Rubber Cover In- 

 .cr Bushing. 6"— Soft Rubber Gasket. H— 

 Positive Flate. 7— Negative Plate. 7f— Poles. 



Positive Plate. J " - 



tliin sheets of hard rubber are next placed between the outside 

 negatives and the can ends, and after a hard-rubber washer is 

 slipped over each pole, the top is placed in position and welded 

 on. 



.\ hard rubber Ijusliing is next placed over the poles to in- 

 sulate them from the can top. Into the little well around each 

 pole is placed a pure gum gasket, followed by a metal ring. 

 The hard-rubber threaded glands are forced home, resulting in 

 the compression and expansion of the gasket, with consequent 

 sealing around the poles. Mounted on the top between the 

 two terminals is the gas vent and filling aperture combined. 



The electrolyte is then put into the cell. This is composed 



