Chapter XXVII: Section 33: ENGINES AND BOILERS COMBINED (see also Boilers, Sec. 6)

VERTICAL ARRANGEMENTS.

=594. In this engine the boiler forms the standard for support= of engine parts, but it is better to fix these on a vertical bed-plate bolted to the boiler, or as No. 595.

=595. Any type of vertical engine and any type of vertical boiler= can be combined on this plan.

=596. Vertical boiler= (any type) and horizontal engine (any type).

=597. Any type of vertical boiler,= with short horizontal engine on crown.

=598. Vertical boiler,= with cylinder sunk in the centre of crown.

=599. Overhead crank engine and boiler,= the latter forming the base to which the engine parts are fixed.

HORIZONTAL ENGINES.

=600. Loco.-type semi-fixed horizontal engine.=

=601. Loco.-type semi-fixed horizontal engine,= with engine on top. When placed on wheels this type constitutes the well-known “Portable.”

=602. Horizontal semi-fixed boiler,= with circular shell and engine on top. (See No. 72.)

=603. Horizontal semi-fixed boiler,= with underneath fire-box. (See No. 71.)

Section 34.--ELLIPTICAL MOTION.

=604. Ellipsograph;= by gearing; the bevil wheel ~A~ is fixed, the other three revolving with the whole machine on the fixed central standard, the distance ~A′~ should equal the difference between the major and minor axes of the ellipse.

=605. Performs the same operation= in a similar way; ~A~ is fixed; ~B~ is same diameter as ~A~; and ~C~ = ¹⁄₂ diameter of ~A~ and ~B~.

=606. Common trammel or ellipsograph.=

There are other forms of apparatus for _drawing_ ellipses merely (see
Knight’s Dictionary of Mechanics). See Trammel Gear, Sec. 40.

=607 & 608. Two forms of ellipsographs= or elliptical cranks.

See also No. 144.