London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 233
■I I I I 1 ■f 10 is I 20., 220 Improved Mtihuds of constructing Valves or Sluices, A* 38 … at its upper end, consists of a fork (z z), with a strap-link at eachextremity, which takes the crank-pin (o^) at each side of the disk,or solid wheel {a), with teeth on its edge, and wrought by a pinionand winch, as before described. At each side of this disk is castto it a roller (o o), or drum,…
Architecture
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