London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 571
Arts for Scotland in December, 183.3, and it is thus described in JamesonsJournal ioT October, 1835:— The spring is contained in an iron box, 11 in.by 7 in., and H in. deep, and consists of two horizontal wheels, marked onthe section aa\jig. 235.), lying close above, and parallel to, one another,… … levers (c c), which move on the pivots (d d), close to which the triple springs(e e) are made to press upon these levers. When the lever or door is pressed or opened to the right hand, the underwheel is forced round, drawing back the lever (c) by means of the chain {b),which lever the spring {e)…
Architecture
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