December 1. 1919. | 



THE INDIA RUBBER WORLD 



cording to the character of equipment. Horns used with the 

 device are , similar to the well known electric auto horns and 

 vary in shape according to whether it is desired to scatter the 

 sound, to intensify it in a horizontal direction, or to deflect it 

 •downward. The horns are connected to an available 110 or 



the volume of rubbc 

 better lasting 



The Klaxocator. 



-220-voIt circuit, either direct or alternating current, while only 

 a small current from a few dry cells is used in the central in- 

 .strument. 



When it i< desired to call some person, the operator sets the 

 desired person's code number on the dial and pulls a lever. 

 The contact shaft is set in motion instantly by the spring and 

 the circuit is closed a certain number of times in accordance 

 with the position of the code drum. Every time the battery 

 circuit is closed the relay closes the power circuit and operates 

 all the born>. whistles, gongs and lamps connected to it. Hav- 

 ing sounded the complete call three times, the number indicator 

 returns to its original position and the mechanism is ready for 

 the next call. Xumbers may be sounded as many as three times 

 if desired. ( The Klaxon Co., 1 Madison avenue. New York 

 City.) 



ELECTRIC SPACE HEATERS. 



This is a steel-jacketed heater of special design intended for 

 heating crane cabs, out houses, valve, pump and meter houses. 

 In rubber mills there are undoubtedly many places where this 

 device can be used to advantage in winter weather. 



Each heat- 



) 



mg current 



lighting or power circuit of 115. 230, or 250 volts 

 pressure. These heaters can be mounted 

 groups or singly at different locations and ad- 

 •ditions may be made as easily as adding electric 

 lamps. The heaters are flat like an ordinary ruler, the thickness 

 "being 3/16^inch. the width l'/^ inches, and the length 24 inches. 

 (The Cutler-HamiTier Manufacturing Co., Milwaukee, Wiscon- 

 sin.) 



CIRCULAR MANDRELS FOR CURING INNER TUBES. 



The principal advantages claimed for inner tubes that are 

 •cured on circular mandrels arc that they conform to the shape 

 in which :hey are used in Ihc casings, meaning a more uniform 



thickness i 

 of much 

 quality. 



The illustration shows a 

 popular type of a circular 

 tube-curing mandrel before 

 the tube is applied, and the 

 spring-controlled section 

 explains how the mandrel 

 is made practically endless. 



These mandrels are made 

 in all sizes, from 3 to 12 

 inches in section, the 6- 

 inch size and larger being 

 particularly advantageous, 

 due to their comparative 

 lightness. (The Republic 

 Tool & Manufacturing Co., 

 Cleveland, Ohio.) 



used and resulting in a tube 



MACHINERY PATENTS. 



MACHINE FOR APPLYING RUBBER CEMENT. 



THIS M.\CHiXE applies cement in a semi-automatic manner to 

 rubber clothing, gas masks and other articles made of 

 rubber. 



A front elevation of the machine, partly in section, is shown 

 in Fig. 1 and comprises 

 a frame and table simi- 

 lar to an ordinary sew- 

 ing machine. An end- 

 less belt A runs over a 

 bridge B, provided with 

 a depression or groove 

 in its upper surface, and 

 detachably resting on 

 the privoted angular 

 pieces C, C, which may 

 be swung away from 

 the belt pulleys as indi- 

 cated by the dotted 

 lines on the left. 



Chain D is connected 

 to a treadle at the base 

 of the machine, and 

 passing through the 

 angular arm, connects 

 with the pivoted lever Fig. 1. Elevatiox Partly in Sec- 

 E (See Fig. 2) that tion at Right Angle to the 

 bears against the bot- Plane of Fig. 2. 



tom of the cement receptacle F, which is fastened to the cement 

 chute G. sliding within an outer tube that is forced away from 

 the angular arm by a powerful spring H. Thus, when the treadle 

 is depressed the cement chute is raised and by spring action is 

 forced away from the belt A to the position shown in Fig. 2. 



In applying cement to objects of irregular outlines such as 

 gas masks, the object is placed under a cam-shaped pattern 

 and when revolved, the cam follower attached to the cement 

 chute evenly distributes the cement. For straight seams the 

 cement chute is used in combination with the belt A as shown 

 in Fig. 3. In applying cement to endless objects such as cuffs 

 of rain coats the angular pieces C. C, are swung out of place 

 and the object to be cemented is slipped laterally over the belt 

 A (See Fig. 1). When cement is to be applied to adjacent over- 

 lapping edges of two objects, the fabric is forced into the de- 

 pression in the bridge B by the cement chute, forming an 

 angular configuration, so that both of the overlapping edges are 

 cemented in an equal manner. (See Fig. 1.) 



