Chapter CXV: Section 32: Engines, Types of

(_See also p. 76._)

=2127. Beam engine,= compound; with diagonal cylinders for compactness.

=2128. Steam cylinder,= with diagonal flange joint for the valve chest--enables the valve face to be easily planed, and dispenses with a separate casting and joint for the box.

=2129. Pumping or blowing engine,= with side rod-crank motion.

=2130. One crank and one eccentric engine,= with cylinders at right angles. The same eccentric operates both slide valves.

=2131. One crank engine,= as last described.

=2132. One crank three-cylinder engine.=

=2133. Sliding cylinder engine,= with three-throw crank and three connecting rods. The distribution of steam is made by the reciprocating motion of the cylinder over ports in the bedplate.

=2134. Compound high-speed enclosed engine.=

=2135. Compound engine,= with ~T~ connecting rod and one crank, no dead centre.

=Crank motions.= See Section 21.

=2136. Three-cylinder high-speed box engine,= single acting.

=2137. American type= of walking beam paddle engines.

=2138. Diagonal engine,= with vertical air pump, worked by a bell-crank lever.

=Vacuum engines.= Two forms of this type of engine have been
manufactured in which steam is employed at atmospheric pressure and
condensed in a jet or surface condenser, the working pressure being
therefore atmospheric and never exceeding 14 lbs. per square inch
absolute. These engines and their boilers are free from risk of
explosion, but require a good supply of condensing water.