American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 629
y do not cut it in anyway. The exact length of wire to be tested should be placedin the jaws so that when everything is ready for the test the jaws of the machine will bejust 10 inches apart. The machine should then be slowly started and always at asnearly a uniform rate of speed as possible, for… … MECHANICAL TESTS OF TELEGRAPH WIRE. 517 the beam back to a balance the bob b is moved along the scale. This is continueduntil the wire breaks, when the number of pounds indicated on the scale is noted.This will be the tensile strength of the sample. TEST FOR ELONGATION.—The test for elongation or,…
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-607-387.webp)
