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- Minutes of Proceedings of the Institution of Civil Engineers, Vol. 36
Minutes of Proceedings of the Institution of Civil Engineers, Vol. 36
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Excerpt from Minutes of Proceedings of the Institution of Civil Engineers, Vol. 36: With Abstracts of the Discussions, Session 1872-73 Part 2
An air-buffer at the back of the percussion cylinder has been introduced, with great advantage.
The strong spiral spring K (vol. Xxiii., Plate for pushing forward the catches q', has been suppressed, and substituted in more recent machines by a new arrangement (plate 10, Fig. 3, T) by which the air, acting on a small piston, performs the same office.
The rotation of the borer, formerly effected by the turning of a square arbor in the piston, is now performed at the end of the frame, near the face of the rock, where the torsion is much less.
The machine as a whole is better balanced, and the repairs required have considerably diminished of late years.
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