Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 195
Fifi. 7.SiIKAL-WEU) TUUE MAClIINi:!; … Mar., 1892.] Spiral Weld Tube Machinery ^77 ing pulley now be revolved, the rock arms would oscillateto and from each other in one plane. In order, however,to secure a feed, the rock arms were given a helicalmotion, which was secured as follows : Upon the back end of the shaft V was keyed an arm…
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