Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 413
y seen by referenceto the accompanying illustration. It will be seen from the illustration that with this arrange-ment of valves there could be no lap or lead in the distributingvalves on the cylinder faces, because the valves had to act alter-nately for steam supply and exhaust, and any lap or… … Pig. 2; Spur-Gear Elevator Engine. cal in its use of steam; and while it was a great favorite at thetime of its introduction, and for many years afterward (because ofa lack of anything better) it has, since the introduction of the 818 ELEVATORS hydraulic and modern types of electric elevators,…
Architecture · Building · Carpentry
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