. Electric railway journal . No. 1—Apparatus used in making tensile tests ontapes, cloths and cords. No. 2—Apparatus used inmaking rupture tests on papers. No. 3—This appa-ratus is used in testing the strength of MAKING TENSILE STRENGTH AND RUPTURE TESTS OF CLOTHS, PAPERS AND CEMENTS or breaking point in pounds is registered on an indicat-ing scale attached to the upper clamping jaw of the ma-chine. Tests are made on a number of samples and anaverage value is taken as the final result. A test made on five samples of cambric such as isused in making treated cloth shows the following:
. Electric railway journal . No. 1—Apparatus used in making tensile tests ontapes, cloths and cords. No. 2—Apparatus used inmaking rupture tests on papers. No. 3—This appa-ratus is used in testing the strength of MAKING TENSILE STRENGTH AND RUPTURE TESTS OF CLOTHS, PAPERS AND CEMENTS or breaking point in pounds is registered on an indicat-ing scale attached to the upper clamping jaw of the ma-chine. Tests are made on a number of samples and anaverage value is taken as the final result. A test made on five samples of cambric such as isused in making treated cloth shows the following: Test No 12 3 4 5 Warp 50 52 40 41 42 = 45 lb., average Woof 22 27 24 31 29 = 27 lb., average The warp represents the thread running lengthwisein a woven material, while the woof is the name givento the threads carried by the shuttle; , those runningcrosswise of the fabric. To determine the comparative strength of the variouspapers used for winding cells, U-pieces and for foun-dations for built-up mica wrappers, etc., a Mullen test-ing machine having a capacity of 100 lb. pressure isused. The test specimens are cut 3 in. square fromthe commercial rolls of paper. The test piece of paper Untreated materials . 125-
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