652 



THE INDIA RUBBER WORLD 



[August 1, 1917. 



resisting metal of the nature of lead were not altogether satis- 

 factory, due to the difficulty of keeping the scat tight and the 

 frequent trouble occasioned by the stom sticking in the body of 

 the valve. 



Fairly satisfactory results have been obtained by using the 

 ordinary ammonia valve in which the steel disk usually fur- 

 nished with these valves is substituted by a disk filled with soft 

 lead that is easily renewed when it becomes worn and leaky. 



In view of the evident.difficulties 

 in obtaining a suitable material for 

 acid-resisting valves, it is interest- 

 ing to note that' a comparatively 

 new alloy has 

 been used with 

 great success 

 for this purpose. 

 It is known as 

 "Duriron," and 

 is claimed to be 

 impervious to 

 the action of 



nitric, sulplniric. acetic and many other acids in all degrees of 

 dilution. 



Prior to the advent of Duriron — about five years ago — there 

 was no single metal from which acid valves and other chemical 

 apparatus could be made which would resist corrosive and 

 erosive action. Duriron is a hard, close-grained metal having 

 a particularly uniform quality, taking a fine finish, and being 

 practically non-corrodible. Valve seats made of it will hold 

 their original condition of tightness for an indefinite length of 

 time. 



In many cases plug cocks possess advantages over valves. 

 because they are quick and simple to operate. The main objec- 

 tion to this liability to stick or "freeze" has been overcome by 

 plug cocks made of this metal, as experience has proven that 

 they seldom if ever stick. 



Duriron is employed in the form of castings, and on account 

 of its exceeding hardness, its finished surfaces are machined by 

 grinding. Many "useful implements, utensils, pumps, contain- 

 ers, etc., are made of this material. [Duriron Castings Co., 

 Dayton. Ohio.] 



SECTIONAL STEEL SHELVING. 



During the past few years there has been a growing demand 

 for strong, interchangeable and portable shelving suitable for use 

 in the office or plant of a rubber mill. Wooden shelving has 

 failed to be generally accepted and therefore the development in 

 this material has been slow. Sectional steel shelving of unit 



construction that is sold at a comparatively moderate price has 

 proved very satisfactory for both office and factory use. 



This shelving, known as "Multi-Unit" shelving, is built of extra 

 heavy sheet steel with the idea of making it available for heavy 

 duty service in factories and in places where the shelving would 



receive more or less rough usage. It can be arranged in sections 

 by the multiplication of any number of units. All of the units 

 solidly interlock and all parts are interchangeable which allows 

 the greatest variety of arrangement. Another feature is that the 



Air 



shelves and uprights have tubular edges, which serve not only 

 to add to its strength but give it a very attractive appearance, 

 especially when it is finished in the colored enamels. 



The shelving is supplied in plain steel so that it can be painted 

 at will, or it is furnished in a finish of black or olive green 

 enamel. The uprights have paneled sides and the shelving 

 is furnished with paneled backs, when backs are desired. 



At the present time the units are furnished in standard size. 

 36 inches long, 12 inches high and 12 inches wide, and the stand- 

 ard stack, which is being put out at present, is five shelves high, 

 but this can be arranged in any way to suit the purchaser's con- 

 venience. [National Scale Co., Chicopee Falls, Massachusetts.] 



THE DAFT FLEXIBLE COUPLING. 



There are many installations of machinery in rubber and 

 other mills where the solution of the power transmission problem 

 requires a flexible coupling. This is particularly true in con- 

 necting up gen- 

 erators, either 

 to direct drives 

 from counter 

 shafts or in mo- 

 t o r generator 

 sets where a 

 flexible connec- 

 tion is neces- 

 sary to allow 

 the armature to 

 float in its true 

 field. Also, on 

 the mill line 

 where sudden 

 shocks are of such frequent occurrence and errors of alinement 

 often occur, some sort of flexible coupling is considered indis- 

 pensable. .Applied to calenders, the torque is rendered uniform 

 and backlash efl^ectively precluded by a flexible element provided 

 on the drive shaft. 



The Daft coupling here shown is of particular interest, due 

 to the fact that its flexibility and driving power depend on a 

 specially compounded rubber medium of novel form. Two types 

 of this coupling are made; one is articulated to permit installing 

 without disarranging the line, and the other is of the integral 

 or solid type. The dielectric property of the rubber connection 

 used in these couplings affords perfect insulation when they are 

 used in connection with direct driven motors or generators. 

 [Rubber Insulated Metals Corporation, Plainfield, New Jersey.] 



