The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 108
the shrinkage in very dry weatheramount to anything near this, the driving in of an additional safely wedgewill make the key as fast as ever ; and it will then become more perfectthan at first, as its fibres will be more closely compressed, and consequently,less subject to alteration in size by… … Fig. 1 is a vertical section of the chair, showing itf key and wedge.Fig. 2 is a flat or front view of the fastening wedge. A is the chair, lithe rail. C a wooden key driven in a horizontal direction between the railand chair, and transversely across the chair. D is the metal wedge drivenvertically…
Architecture · Civil engineering · Science
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