296 



THE INDIA RUBBER WORLD 



[March 1, 1913. 



hose is high the removals are email, and the test results are bet- 

 ter than the general average. 



"G" has a good average life probably due partly to the small 

 percentage of hose damaged in service. The average result of the 

 test is good, with the e.xception that the stretch of the outer tube 

 is above the average. 



If^ X 22-inch air hose is used on freight cars only, and is not 

 subject to the peculiarities of the auto hose connector as is tlie 

 case with the 1^ x 22 inches. 



Data sheet "B" shows number of this hose removed for all 

 causes during the year from November, 1911, to November, 

 1912, this being classified in the same manner as the 1% inch x 

 22-inch air hose. 



Makes "E" and "H" represent small purchases made about 

 three years ago, and may be eliminated from a study of the data 



DATA SHEET "B." 



PERFORMANCE lys-I.NCH AIR HOSE, FREIGHT 



Item A B C D 



as our records cover onlv the hose having probably the longest 

 life. 



The same criticism which applied to make "F" of the I'/s inch 

 X 22-inch air hose applies in every particular to the 1% inch x 

 22-inch air hose. 



"G" may also be eliminated as none was purchased during the 

 three-year period and only five failures arc recorded. 



"A" and "B" represent a considerable number of lengths with 

 sufficient failures to afford proper comparison. The results of 

 tests indicate that "B" is the better hose and this is confirmed 

 by increased life. 



"C" hose has a friction inferior to the average and the life 

 is low. 



"D" has the highest average life and the tests show a good 

 inner tube and the best friction. 



H Totals 



c ": 



Damaged in service 



t'er cent, of total 



_28_ 

 13 



60 



112 



17 



28.6 



Average life, months 10.25 



17.55 



5.34 



_4.06_ 

 12 



13.4 

 21.2 



22.6 

 9.14' 



_5.9_ 

 35.0 



_14.25 

 14.4 



Burst in service 



128 



193 



14 



29 



14 



46 



Per cent, of total 59.3 



54.7 



33.3 



^^1 Average life, months 21.45 



i«~i Deteriorated .^.i 



22.4 



87 



Per cent, of total 23 . 1 



24.7 



J. 2. 05 



3 

 14.2 



29.1 



28.8 



19.3 



40 



40 



26.3 



V CI 

 <n > 



u 



Average life, months 21.8 



20.8 



12.33 



27.5 



24.3 



17.3 



27 



26.4 



22.5 



Other causes 



14 



34 



Per cent, of total 3.24 



3.97 



23.8 



8.12 



1.92 



12.9 



20 



4.33 



Average life, months 11 



Total failures 216 



J7^.35_ 



352 



9.8 



14.5 



21 



24 



_24_ 



52 



12 



14 



31 



85 



786 



