Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 422
Fio. 971. 1870 John T. Ward, C. E., introduced a ball-and-socket pipe in which thesocket was turned but the ball was fitted by a lead packing run in. There wassome danger to the socket by the stress of the ball if the movement was in ex-cess of that contemplated. Mr. Ward in his late designs made…
Mechanical drawing
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-911-588.webp)
