Experimental engineering and manual for testing. For engineers and for students in engineering laboratories (1906)
Carpenter, Rolla C. (Rolla Clinton), 1852-1919 · New York, J. Wiley & Sons; [etc., etc.] · leaf 162
first is a telescopeprovided with levelling-screws, mounted on a horizontal andvertical axis and furnished with supports tor two linear scales,which may be arranged so that the reflection will show inmirrors attached to the specimen. The second part consists ofa frame which can be fastened to the… … Fig. 75.—The Marshall Extensometer Fig. 76.— Jennings Extensometei is brought in contact on one side with the test-piece, and onthe other with the spring side-bar. The elongation of thetest-piece causes an angular motion of the mirror, which inturn causes a multiplied motion of the reflection of…
Building materials · Machinery
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