536 



THE INDIA RUBBER WORLD 



[July 1. 1914. 



A NEW SLIDE RULE FOR RUBBER MEN. 



P E. YOUNG, of the Acushnet Process Co., has devised a 

 ' * calculating machine for the rubber worker which is an 

 adaptation of the slide rule to this particular business. 



By looking at the cut it will be seen that there is a kind of 

 slide rule placed over a sliding board with most of the com- 

 pounding ingredients arranged on this board according to their 

 specific gravity. The spacing is according to the logarithmic 

 scale and the slide rule has a corresponding scale marked specific 

 gravity uiiicli is C' impIiiiuntaiA' t'l the scale nn tlic board. 



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fUUNG'S SPECIFIC GRAVITY & COMPOUND COST CALCULATOR 

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ACUSHNET PROCESS COMPANY 

 NEW BEDFORD, MASS. 



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Each ingredient has a hne on the board running to the zcio 

 point at bottom. .Mong the side of the board is a scale running 

 to 100 and the iixed ba.se board has an inde.x mark at A. 



On sliding out the face board directions for operating the 

 apparatus are disclosed printed on the base board. 



SPECIFIC tmAVITV. 



To obtain the specific gravity of any proposed compound you 

 first place the board in such position that the percentage of 

 rubber is opposite the index .(. Then move the slide across 

 till the index C which is attaclicd to the slide is on the line 

 of the ingrediei'.t. 'I hen move runner to left to the stop. Repeat 

 the above operation for each mixing ingredient till the 100 per 

 cent, of ingredients are accounted for and then read the specific 

 gravity indicated under tlie hair line on the glass face of the 

 runner. 



-\s an example we make a compound of 45 per cent, rubber. 

 45 per cent, zinc oxide, 5 per cent, magnesium carb(5nate and 

 5 per cent, sulphur. By making two settings of the hoard and 

 four of the slide we read off immediately 1.675 as the specific 

 gravity of the compound. Of course, this is based on the idea 

 that all the ingredients are simple mixtures in tlie compound 

 and no chemical combination is formed which would have a 

 different specific gravity from the mixture. 



Using an ordinary slide rule for this would require that a 



setting be made for the percentage and specific gravity of each 

 constituent and a table of specific gravities of each element mu.st 

 be at hand or known. Then each reading must be copied down 

 and some figuring done on paper before the correct gravity is 

 arrived at. 



On the rule there is a second scale under the gravities whicli 

 shows the cubic inches per pound. 



The sliding board is reversilile and on the other side there is 

 a ruling of percentages. Using this table, it is only necessary 

 to place the slide at cost of first ingredient and move the cross- 

 slide till index C is at the percentage, then move runner to the 

 left till it meets the stop. Then place index A at cost of ne.xt 

 ingredient and repeat till each ingredient is accounted for. The 

 total cost will appear under the cross-hair of the reading glass 

 on the runner. 



.\nother computation uliicli may be made is that of batch 

 weights. In this case, using the cost chart, set the cross-slide 

 so that index registers one hundred and index A is at total batcli 

 weight, move the runner to the percentage of the ingrediciit 

 wanted and the weight will appear under the scratch line on 

 the runner at the lowest line on rule marked "Batch Weight." 



It would appear that this would prove a time saver for any 

 one w'hose duly or interest requires the calculations outlined 

 above on rubber compounds. 



This article is useful not only to the rubber industry, but tc 

 iither like industries. For example: If linseed oil is substituted 

 for "rubber," as its specific gravity is .937. which is close to that 

 of rubber, the calculation for the specific gravity of mixed paints 

 may be made. In fact, such an instrument has been used in 

 England for a long time. 



The article is made by Keuffel & Esser Co., of New York, and 

 is made in their careful and accurate stvle. 



AMERICAN COTTON INDUSTRY WITHOUT A TRUST. 



Mr. C. J. H. Woodbury, Secretary of the National Association 

 of Cotton Manufacturers, is authority for the statement that 

 those capable of giving sound opinions believe that there is an 

 adequate cause for the superior quality of foreign cotton goods 

 .ind for many of the economies in their production in the con- 

 centration of effort in the methods of cotton manufacturing, to 

 which the law in Europe gives full acquiescence. 



SKATING ON ROUGH ROADS. 



Roller skating is a pastime that is exceedingly popular 

 with young people everywhere, but for its thorough enjoy- 

 ment it requires smooth walks or pavements. Application 

 has been made for a patent that will enable a person to skate 

 with comfort on rough roads. These skates are in reality 

 a pair of ordinary bicycle wheels, a stiff iron rod being 

 dropped from the hub and skating shoes being attached 

 firmly to the iron rod. the sole of the shoe coming within 

 about 3 inches of the ground. With this arrangement of shoe 

 and firm attachment to the hub the skater is as secure as on 

 the ordinary roller skates, while with the pneumatic tire he 

 can. of course, go over fairly rough ground with perfect 

 comfort. It is a rapid method of ground-covering, but as 

 the weight of the skater naturally falls within the point of 

 contact between the tire and the ground, it requires some 

 practice to use this form of roller skate successfully. 



While in this country cotton goods are packed for account of 

 the mill, deliverable at some distant city, in England they are 

 delivered to the customer in the cloth room of the mill. A dif- 

 ferent packing concern will then send its men to the cloth room, 

 at tlie expense of the purchaser, packing the merchandise accord- 

 ing to the needs of any specified market. One of these concerns 

 has a capital of $5,000,000, and several of them $1,000,000 each. 



