Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 198
Fig. 3. Fig. 4. (4) The axles of all pipes were the same, and to changefrom one size to another was a long and unsatisfactoryoperation, as it required new dies and new hammers, bothof which met the pipe at its topmost point. The Spiral Weld Tube Company was organized aboutthe time of Mr. Roots…
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