Senior course in mechanical drawing by Thorne William H

Author:Thorne, William H[enry], 1847- [from old catalog]
Language: eng
Format: epub, pdf
Tags: Mechanical drawing
Publisher: Philadelphia, Williams, Brown & Earle
Published: 1897-03-25T05:00:00+00:00

atmosphere, so that the exhaust steam which has done its work in the preceding upstroke, has had free exit.

With the further rotation of the crank, the valve moves upwards to the central position shown in Fig. 4, where it is on the point of exhausting the steam above the piston and has just closed the exhaust below. This is therefore the final point at which the expansion of the steam above the piston is fully utilized, and also the point at which the compression of the exhaust steam below the piston commences.

The remainder of the half-revolution of the crank results in opening the top port to the exhaust and in keeping the bottom port closed during the travel of the lap, thus making a period of compression during which the exhaust steam below the piston acts as a cushion to overcome the inertia of the moving parts of the engine, and is brought up to a pressure approximately equal to that in the boiler by the time the valve opens the bottom port to the live steam. When the crank arrives on its bottom centre, Fig. 5, the eccentric-centre is diametrically opposite its first position, Fig. 1, and the valve has opened the bottom port the amount of the lead, ■£%". The same relative movements will then occur during the up-stroke of the piston, the admission, expansion, and exhaust of the steam below and the exhaust and compression of that above occurring when the crank arrives at positions diametrically opposite those during the down-stroke.

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