Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . nts of the crank, to whir-h it is directlyattachfd without the intervention of a connecting-rod. This construction is economical of space andweight. The trunnions are hollow, and are connected bysteam-tight joints, one with a steam-pipe leadingfrom tile boiler, the other with an e.\haust-pipe lead-ing to the condenser. The va/vc-c/icst oscillates with the cylind
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . nts of the crank, to whir-h it is directlyattachfd without the intervention of a connecting-rod. This construction is economical of space andweight. The trunnions are hollow, and are connected bysteam-tight joints, one with a steam-pipe leadingfrom tile boiler, the other with an e.\haust-pipe lead-ing to the condenser. The va/vc-c/icst oscillates with the cylinder. Various arrangements are used to a<lapt the valvegearing to the oscillating motion of the cylinder andvalve-chest. One of the simplest is to communicateniotiou from the eccentric to a sliding rod, on whichis a cross-head of the form of an arc of a circle de-scribed about the axis of the trunnions, when thevalve is in its middle position and having in it a slot of the same figure; in that slot is a slider at-tacheil to the end of a lever arm projecting from arocking-shaft attached to the cylinder ; another armprojecting from that shaft moves the form of valve common in engines of thi& Fig. O^ctUatin^ CijtindiT Sttam-Eiti;int. class is the trunnion-valve either of a disk form orhaving the shape of a fnistum of a cone, in eithercase one portion of the valve having a rotary Iecip-rocation derived from the oscillations of the cylinder. Fig. 3430 is an engine of this character for landuse. The power may be communicated by a leatherband over a pulley fixed on the axle of the fly-wheel,or by means of a spur-wheel and pinion. The steamis admitted through the hollow axle on one side, andwitlulrawn through a similar hollow axle at the op-posite side of tlie cylinder. The figure gives side and front elevations, respec-tively. The top works are sup- Fig. 3431. ported by a four-column frame. Fig. 3431 is an-other form of os-cillating -cylinilerSt eam-engi
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