Items related to Notes to supplement Holmes' steam engine
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ... dilute mixtures were used. Fig. 26 is a sectional plan showing valves, passages and the cylinder and piston. Fig. 27 is a transverse vertical section through the cylinder at the line a b. The admission of the charge and the expelling of the exhaust are accomplished through the same passage, so that the cylinder has only two ports, as in the steam engine; two valves are used, one working outside the other. The inner valve has five ports, two for admitting the charge, one for exhausting, and two for carrying the igniting flame. The ignition by flame was first accomplished in a workable manner by Hugon, although it had been described in several patents long before his time. The ports marked 1 1 in the inner slide A are admission, the K ports marked 2 2 in the inner slide are igniting, ports; the port 3 is the exhaust passage, alternately communicating with each end of the cylinder by the long ports 4 4 to the exhaust port 5, precisely as in a steam engine. The action of the admission ports is somewhat novel. The object is to secure a rapid opening and cut-off, bringing the igniting flame on immediately after closing the cylinder. The valve is actuated from a cam. When the piston is at the end of its stroke and is moving forward, the valve A is moving in the same direction, the port 3 is allowing the exhaust gases to escape from the other side of the piston, the port 1 is open to the cylinder and is communicating through the port 6 or 6, in the outer slide B, with the air and also with the gas supply. When the piston has taken in sufficient charge, the cam moves the slide A suddenly forward, so causing the port 1 to close on the outer side but not on the inner; the igniting port comes on and the flame burning in it inflames the mixture, filling the engine port...
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