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Scientific American, Vol. 41, No. 6 (August 1879) (1879)

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An illustration from Scientific American, Vol. 41, No. 6 (August 1879), 1879, leaf 0
ears ago, at peculiarity of their construction, the gateTjeing kept in line Before leaving the works, every valve is carefully tested Waterford, near Troy, and met with such speedy success that by the parallel seats. under heavy pressure to ascertain if it is perfectly tight and the present company… … FACTORY OF THE LUDLOW VALVE MANUFACTURING CO. © 1879 SCIENTIFIC AMERICAN, INC

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