April I. 1919] 



THE INDIA RUBBER WORLD 



365 



New Machines and Appliances. 



A SIMPLE AND EFFICIENT LINE-SHAFT COUPLING. 



ALINE-ihaft coupling that is simple yet strong in construc- 

 tion — that will not slip when installed and one that can 

 be applied by means of only a hammer, is shown in the 

 accompanying illustration. It is of the rigid type and obviates 

 the trouble of slipping peculiar to friction grip couplings or poorly 

 fitted keyed couplings. 



This coupling is easy to install by inserting the end of each 

 shaft into the i'orc of the coupling, and hammering the cupped- 



The Pintite Rigid Couplinx.. 



end pins into place. These tempered tool steel pins cut their 

 own seats in the shafts. They also w^edge the shafts into the 

 recess provided in the opposite side of the coupling, and so a 

 very powerful driving grip is obtained. (Smith-Serrel Co., Inc., 

 90 West street, New York.) 



COST OF STEAM REDUCED BY UNDERFEED STOKER. 

 The accompanying diagram furnishes the power-plant opera- 

 tor accurate information on the cost of coal for generating 

 steam. Knowing the price, the amount of coal burned, and the 

 quantity of water evaporated, the solution is easy. Start with 

 the cost of coal per ton and project vertically, intersecting the 

 oblique line corresponding to the evaporation being obtained 

 from the boilers from and at 212 degrees F., then move hori- 

 zontally to the left margin, where the cost of coal to evaporate 

 one thousand pounds of water from and at 212 degrees F. is 



Cost of Stedm 



This chart should awaken interest in the relative efficiency 

 of a mechanical stoker as compared with hand firing. The 

 stoker shown in the illustration is the underfeed type in which 

 air is forced into the fuel bed by a fan. A series of corrugated 

 tuyeres, o v e r - 

 lapping one an- 

 other, form ribs 

 extending from 

 the hopper on the 

 outside of the 

 furnace to the 

 center of the 

 bed. These rows 

 of tuyeres are in- 

 clined and sepa- 

 rate the retorts 

 that carry the 

 coal from the 

 hopper to the 

 bed. They rest 



on air-boxes connected with the main air-shaft, 

 draft enters these boxes and distributes itself to the burning 

 coal through these multiple-openings in the tuyeres. In other 

 words, the entire furnace bed is fed continuously and evenly 

 with thousands of minute jets of air, which means perfect com- 

 bustion of the coal and little or no smoke. (Westinghouse Elec- 

 tric & Engineering Co.. East Pittsburgh, Pennsylvania.) 



A NEW HORIZONTAL CEMENT CHURN. 

 The cement churn here pictured possesses several construc- 

 tive features that will at once appeal to the maker of rubber 

 cement. It is built along simple yet sturdy lines and with 

 only two bearings that are exposed to wear. The shape of 



W'estixchouse Uxderfeed Stoki 



The forced 



given. The chart can 

 required to generate 

 above process. 



d to iletermiiie ilit- cxaporation the barrel automatically works the contents from end to end, and 

 certain cost, by reversing the over and over, as the churn revolves, thereby producing a thor- 

 oughly mixed solution in the shortest possible time. 



