JULY 1, 1916.] 



THE INDIA RUBBER WORLD 



531 



the temperature for which the controller is set. When the steam 

 tirst enters, it has little effect on the tlicrtnostatic bulb of the 

 temperature controller E because of the rapid condensation, but 

 as the molds heat up, the condensation becomes less and 

 the thermostatic bulb transmits the temperature effect to the 

 capsular springs of the temperature controller. This gradually 

 expands and moves the transmitting lever within the controller, 

 causing more and more compressed air to flow to the diaphragm- 

 motor valve B, which assumes the throttling position mentioned. 

 Should the steam pressure in the header A increase, causing the 

 temperature within the heater to go higher, this effect is instantly 

 transmitted to the controller, and more compressed air is allowed 

 to enter the top of diaphragm motor valve B, which will close, 

 thus checking the rise in temperature. If, on the other hand, 

 the steam pressure within header A falls, the reverse will occur 

 and the diaphragm motor valve will open wider. 



rn£ TAGUABUE SYSTEM OF AUTOMATIC CONTROL or 

 TIME, TEMPERATURE AA/D EJfHAUST /A- A ThROPR 



Tme PRESS ay means of automatic coMPouno 



FERFECT TEMPERATVRE AMD TIME CO/TTROLLERa 



Figure 2, Automatic Control Applied to 

 Vertical Heater. 



In the meantime the exhaust control portion of the controller 

 £ is intermittently draining the heater, because, as the condensa- 

 tion or the supersaturated steam, which is at a lower tempera- 

 ture, comes in contact with 'he thermostatic bulb of the latter 

 it causes the diaphragm motor valve on the exhaust line to open, 

 and the steam within the heater will eject the water and super- 

 saturated stream. But when dry steam contacts with the ther- 

 mostatic bulb it will cause the diaphragm-motor valve to again 

 «lose. This occurs periodically during the vulcanizing period. 

 During this time the hand of the time controller K has been 

 slowly returning to the starting point. When the time is finally 

 up this hand trips the time controller mechanism and compressed 

 air, flowing through the time controller, with shut off diaphragm- 

 motor valve B, the steam inlet valve. At the same time com- 

 pressed air flowing to the "reverse acting" diaphragm-motor 

 valve on the exhaust line will cause the latter to open wide, 

 allowing all of the steam left within the heater to be vented out. 

 In ■ addition, as already mentioned, the operator is signaled so 

 that he can unload the press and get ready for another cure. 



The time controller can also be arranged, although it is not 

 thus shown in Figure 2, so that it will cause a third diaphragm- 



motor valve to open wide when the vulcanizing period is up, and 

 cold water will flood the heater until the operator shuts off the 

 water supply. 



The water of condensation settles in the exhaust chamber A/' 

 in Figure 2. This chamber has two outlets, as shown, each of 

 which is provided with a diaphragm-motor valve, one of said 

 valves being a direct acting and the other a reverse acting valve. 

 The direct acting valve opens when the compressed air pressure 

 is relieved and closes when the air pressure enters the top. This 

 valve is in connection with the exhaust control part of the com- 

 pound controller shown at £ in Figure 2. When the tempera- 

 ture gets low this valve opens, thus venting the heater until dry 

 steam comes in contact with the thermostatic bulb. The reverse 

 acting valve mentioned is connected to the time controller, and, 

 being reverse acting, remains closed while there is no air pres- 

 sure on the diaphragm top. When, however, the time controller 

 functions, and allows air to pass and flow to the top of this 

 reverse acting diaphragm-motor valve, it opens wide and thus 

 blows off the apparatus when the time period is up. 



The same arrangement of units can be applied to a horizontal. 

 vulcanizer, used for curing treads, inner tubes or the open cure 

 process. The functioning of the different units is exactly the 

 same as already described. 



THE CONCENTKIC WIRINO SYSTEM. 



There are in almost every city numbers of small houses which 

 the owners will not have wired because the standard forms of 

 wiring are more or less expensive, and with present methods 

 of wiring it is necessary to disturb the wall decorations to 

 obtain neat installations. 



Rubber insulated wire of special construction, intended to be 



installe 

 or pap( 



the surface of the wall and to be covered with paint 

 IS been devised for wiring inexpensive houses. 



Bare concen- 

 tric wire, so- 

 called, has a 

 single, rubber- 

 Co.ncentric W ike insulated, solid 



wire for its in- 

 ner conductor. The outer conductor, or sheath, is composed 



of tinned sheet copper, folded 



longitudinally around the 



wire with a full lap, giving 



uniform, double thickness. 



The laps of the sheath are 



then soldered, forming a 



continuous water and gas 



tight jacket. 

 The special fittings are so 



arranged that joints can be 



quickly made by expert wire- 

 men, and they are designed 



so that the grounded sheath 



is continuous throughout tli> 



system. Because of the p - 



sibility of injuring the ruM . 



insulation on the wire, tl 



use of solder is considered n 



advisable. It is, of cour~ 



necessary that the outer 



sheath be carefully grounded 



at the service switch so that 



the whole system will be 



thoroughly grounded. The 



concentric wiring system can Method of Installing and 



be installed only with a Speoai- Fittings. 



special permit from the local 



insurance bureaus or municipal inspection bureaus. [General 



Electric Co., Schenectady, New York.] 



