there will be no difficulty in carrying out our instructions in
construction.

[Illustration: Fig. 25]

Perhaps it would be as well to give a general description of the model
before taking up the details. A reduced side view of the complete model
is given at Fig. 26. In this cut the escapement model shown at Figs. 24
and 25 is sketched in a rough way at _R_, while _N_ shows a glass cover,
and _M_ a wooden base of polished oak or walnut. This base is recessed
on the lower side to receive an eight-day spring clock movement, which
supplies the motive power for the model. This base is recessed on top to
receive the main plate _A_, Fig. 24, and also to hold the glass shade
_N_ in position. The base _M_ is 2½" high and 8" diameter. The glass
cover _N_ can have either a high and spherical top, as shown, or, as
most people prefer, a flattened oval.

[Illustration: Fig. 26]

The main plate _A_ is of hard spring brass, 1/10" thick and 6" in
diameter; in fact, a simple disk of the size named, with slightly
rounded edges. The top plate, shown at _C_, Figs. 24 and 25, is 1/8"
thick and shaped as shown. This plate (_C_) is supported on two pillars
½" in diameter and 1¼" high. Fig. 25 is a side view of Fig. 24 seen
in the direction of the arrow _p_. The cock _D_ is also of 1/8" spring
brass shaped as shown, and attached by the screw _f_ and steady pins _s s_
to the top plate _C_. The bridge _F G_ carries the top pivots of
escape wheel and pallet staff, and is shaped as shown at the full
outline. This bridge is supported on two pillars ½" high and ½" in
diameter, one of which is shown at _E_, Fig. 25, and both at the dotted