14 



THE INDIA RUBBER WORLD 



[OcTOBtR 1, 1916. 



A CONVENIENT CEMENT CAN. 



Receptacles and cans that are intended to hold inflaniinabk- 

 mixtures should be designed with the idea of reducing the lire 

 hazard to a minimum. Experience has proven that they must be 



made in such a way that 

 their contents in case 

 111 lire will burn off 

 slowly, confining the lire 

 to tlic immediate vicinity 

 instead of exploding and 

 scattering the fire over a 

 large area. 



The illustration .shows 

 a cement can designed 

 for a supply room and 

 line which can easily be 

 transferred to and from 

 the cement house. It is 

 constructed of heavy 

 galvanized sheet metal 

 with slanting bottom and 

 a tight-fitting cover that 

 prevents evaporation 

 and acts as a safety valve in case of fire. The quick closing gate 

 valve saves time and reduces waste. The can is made in two 

 sizes, holding approximately S and 10 gallons, respectively. 

 [United Awl & Needle Co., West Med way, Massachusetts.] 



THE MASTER CHRONOGRAPH. 



Two of the principal causes that result in loss of profits to the 

 rubber industry are loss of time and umiecessary motion. Care- 

 ful investigation would doubtless bring to light in many plants 



the presence of leaks that are di- 

 rectly responsible for the failure 

 to make goods at a profit. 



The master chronograph is a 

 specialized watch that is used as an 

 aid in studying mechanical opera- 

 tions. The chronographic feature 

 operates in seconds and fifths of 

 .seconds. The figures on the ex- 

 treme outside of the dial are 

 spaced one second apart and rep- 

 resent at any point of elapsed time 

 exactly what the corresponding 

 output or production per hour is, 

 when the operation is of one min- 

 ute's duration or less. The figures 

 on the extreme inside of the dial. 

 such as 51, 45, 40, etc., represent operations per hour, when an 

 operation goes past one minute and into the second minute. 

 Between these figures one can easily scale the result. For in- 

 stance : If it requires 29 seconds to perform one operation, as 

 shown by the stopping of the large hand, the reading 124 directly 

 under it is the corresponding output per hour. 



If the hand is stopped over 19 seconds the reading directly 

 under it shows the output to be 190 per hour. 



Let us assutne that the operation is of longer duration than one 

 minute, that the large hand made one entire revolution and went 

 on to ten seconds beyond, or one minute and ten seconds. The 

 reading in that case would be 51 operations per hour, inasmuch 

 as all figures for the second minute are placed on the extreme 

 inside of the dial. 



In the case of very short operations it is usually good practice 

 to time ten operations and add a cipher to the amount shown on 

 the computed dial. 



Let us assume that it is desired to ascertain the number of 



strokes per hour of a press or the production of an automatic 



machine, and while we count ten strokes or pieces, as the case 

 may be, the hand reaches 19 seconds. Reading directly under it 

 and adding one cipher, we have 1,900 as the number per hour. 

 For motion study and lost motion determination, rate stand- 

 ardization, general cost data and all other short time operations, 

 this device is obviously useful. [Mortimer J. Silberberg, Chi- 

 cago, Illinois.] 



MACHINERY PATENTS. 



PORTABLE KAG WRAPPING MACHINE. 



•"pHIS machine, designed for wrapped tread tires, provides a 

 ■•• spider of novel form on which the tire remains from the 

 time it is taken out of the mold, after the first cure, until the 

 completion of the wrapping process and its removal for the final 

 cure. Moreover, the- machine is portable and self-contained, so 



that it may be brought 

 into action successively 

 upon tires supported on 

 different spiders. 



In the drawing, A 

 designates the base of 

 the machine, the back 

 of which rests upon 

 legs B, while at its for- 

 ward edge a pair of 

 bars C are pivoted at 

 D, the upper ends be- 

 ing connected by a 

 handle E. When this 

 is swung downwards 

 the ends of the bars 

 are raised from the floor, and the machine is free to be moved 

 about on rollers F. 



The table G, supported by rods H and standards /, has a 

 central opening above which is mounted on anti-friction rollers 

 the annular gear /, provided with a hinged segment that admits 

 tlie tire to the opening in the table. This annular gear is driven 

 from the vertical shaft that is journaled in the frame and 

 driven by the electric motor mounted on the base plate. 



The fabric spool K, mounted on the annular gear, contains 

 the wrapping strip L, that passes around the tension guide M 

 to the tire N. 



While the tire is being built up, the spider O acts as a core 

 chuck, but in the wrapping operation it assists in rotating the 

 core. The spider has three arms supporting the screws that 

 adjust the three rollers P to the inner circumference of the tire 

 liy miter gearing located in the hub. Each roller is bushed and 

 key-waved to fit the short, splined stub of the portable jack 

 sliaft Q that is driven from the vertical shaft and rotates the 

 tire. 



In operation the hinged segment K is raised and the machine 

 swung in position so that the tire enters the gap when the 

 segment is closed. Then the jack shaft Q that transmits power 

 from the vertical shaft to any one of the rollers P is con- 

 nected up, and the machine placed in motion, whereby the tire 

 is slowly revolved by the pulley P, and the strip of fabric L is 

 spirally wrapped around the tire by the revolution of the hori- 

 zontal gear ./. [William C. Stevens, assignor to the Firestone 

 Tire & Rubber Co.— both of .^kron, Ohio. United States patent 

 No. 1,194.565.] 



MACHINE FOR MAKING AND COATING WEFTLESS FABEICS. 



The method consists in using two parallel warps of threads 

 of indefinite length, each warp having the width of the finished 

 fabric, but each having a number of threads equal to half the 



