[ 87]Mining Engineer, 1865, vol. 35, p. 86

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[ 88]The Engineer, 1865, vol. 20, p. 174

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[ 89]Mechanics' Magazine, 1866, vol. 16, p. 147

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[ 90]Bessemer, op. cit. (footnote 7), p. 294

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[ 91]Ibid.

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