The four pistons are carried upon
the gimbal ring, which connects, by means of pivots, the two chair
couplings.
[Illustration: THE FIELDING HIGH SPEED ENGINE.]
Fig. 10 shows clearly the parts constituting the coupling, cylinders,
and pistons of a compound engine. CC are the high-pressure cylinders; DD
the low pressure; EEEE the four parts forming the gimbal ring, to which
are fixed in pairs the high and low pressure pistons, GG and FF; HHHH
are the chair arms formed with the cylinders carrying pivots, IIII,
which latter fit into the bearings, JJJJ, in the gimbal ring. Figs.
1, 2, 3, 4 show these parts connected and at different points of the
shaft's rotation. The direction of rotation is shown by the arrow. In
Fig. 1 the lower high-pressure cylinder, C, is just about taking steam,
the upper one just closing the exhaust; the low-pressure pistons are at
half stroke, that in sight exhausting, the opposite one, which cannot be
seen in this view, taking steam.
In Fig 2 the shaft has turned through one-eighth of a revolution; in
Fig. 3, a quarter turn; Fig. 4, three-eighths of a turn. Another eighth
turn brings two parts into position represented by Fig. 1, except the
second pair of cylinders now replace the first pair.
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