The following sketches are type drawings of the most important forms of
Steam Engines in use, and are intended to afford a choice of outline
arrangements from which in any scheme under consideration a selection
may be made as a basis, without reference to details.
VERTICAL ENGINES.
=558. Overhead cylinder engine.=
=559. Overhead crank engine,=
=560. Overhead crank engine, cylinder oscillating.=
=561. Overhead cylinder engine,= with oscillating cylinder.
=562. Overhead tandem compound engine.= } These can, of course, be
} reversed and the crank
=563. Overhead double compound engine.= } fixed overhead.
=564. Overhead one-crank compound oscillating engine,= cylinders at
right angles and receiver between.
=565. Overhead double-crank compound oscillating engine,= with receiver.
=566. Overhead crank compound tandem oscillating engine.=
[Illustration: 553.-566.]
=567. Vertical engine,= with top guides, double connecting rods, and
underneath crank shaft.
=568. Vertical trunk engine.=
_Note_ that the trunk plan is applicable to any of the preceding
arrangements, and is employed where a very short engine is required.
=569. Vertical triple compound engine,= single acting cylinders. The
high pressure steam acts first on the under side of the small piston, is
then expanded into the annular under side of large piston, and finally
expanded into the upper side of large piston.
=570. Vertical compound engine,= with annular cylinder. The central
cylinder is the high pressure, and the annular cylinder the low
pressure.
=571. Vertical annular cylinder engine,= with crank below.
=572. Vertical slotted crosshead engine.=
=573. Standard vertical engine;= a type largely used and possessing many
good points.
=574. Double cylinder engine,= with ~T~ connecting rod. (Bernay’s
patent.)
HORIZONTAL ENGINES.
=575. Box bed engine,= high pressure. }
}
=576. Double box bed engine,= coupled end to end. }
} These can, of
=577. Oscillating cylinder engine,= with crosshead } course, be
guides. } duplicated side
} by side.
=578. Trunk engine.= }
}
=579. Return crank engine.= }
=580. Diagonal engine.= See also No. 564.
[Illustration: 567.-580.]
=581. Horizontal tandem compound engine.=
=582. Galloway’s oblique compound engine.=
=583. Double cylinder compound engine,= with receiver, cranks at right
angles.
=584. Trunk bed engine.=
=585. Double piston engine.= The pistons are sometimes coupled to two
crank pins at right angles.
=Condensers= (see Section 25) may be driven (_a_) from horizontal
engines either direct by continuation of the piston rod, or (_b_) may
be worked horizontally below by a vertical rocking beam coupled to the
main crosshead, or (_c_) worked vertically below by a bell crank
coupled to the main crosshead, or (_d_) by a separate small steam
cylinder working independently, or (_e_) by a connecting rod or
gearing from the crank shaft.
For =Jet Condensers= see Section 25.
BEAM ENGINES, &c.
=586. Ordinary pillar and overhead beam engine.=
=587.= Has extended beam and double cylinders, either as a compound
engine or one cylinder may form a pump or blast cylinder. In some
designs the high and low pressure cylinders are placed side by side and
coupled to the same end of the beam by a modified parallel motion.
=588. Side lever engine.=
=589. Plan of beam engine,= with compound cylinders.
=590. Walking beam engine.=
=591. Diagonal engine.=
=592. Three or four cylinder high-speed engine,= with single-acting
cylinders.
=593. Vertical high-speed single-acting engine,= with one or more
cylinders.
[Illustration: 581.-593.]