little gold. The
reason why we recommend imitation ruby cap jewels for the upper holes,
is that such jewels are much more brilliant than any real stone we can
get for a moderate cost. Besides, there is no wear on them.

The pallet jewels are also best made of glass, as garnet or any red
stone will look almost black in such large pieces. Red carnelian has a
sort of brick-red color, which has a cheap appearance. There is a new
phosphorus glass used by optical instrument makers which is intensely
hard, and if colored ruby-red makes a beautiful pallet jewel, which will
afford as much service as if real stones were used; they are no cheaper
than carnelian pallets, but much richer looking. The prettiest cap for
the balance is one of those foilback stones in imitation of a rose-cut
diamond.

[Illustration: Fig. 30]

[Illustration: Fig. 31]

In turning the staffs it is the best plan to use double centers, but a
piece of Stubs steel wire that will go into a No. 40 wire chuck, will
answer; in case such wire is used, a brass collet must be provided. This
will be understood by inspecting Fig. 30, where _L_ represents the Stubs
wire and _B N_ the brass collet, with the balance seat shown at _k_. The
escape-wheel arbor and pallet staff can be made in the same way. The
lower end of the escape wheel pivot is made about 1/4" long, so that a
short piece of brass wire can be screwed upon it, as shown in Fig. 31,
where _h_ represents the pivot, _A_ the lower plate, and the dotted line
at _p_ the brass piece screwed on the end of the pivot. This piece _p_
is simply a short bit of brass wire with a female screw tapped into the
end, which screws on to the pivot. An arm is attached to _p_, as shown
at _T_. The idea is, the pieces _T p_ act like a lathe dog to convey the
power from one of the pivots of an old eight-day spring clock movement,
which is secured by screws to the lower side of the main plate _A_. The
plan is illustrated at Fig. 32, where _l_ represents pivot of the
eight-day clock employed to run the model. Counting the escape-wheel
pivot of the clock as one, we take the third pivot from this in the
clock train, placing the movement so this point comes opposite the
escape-wheel pivot of the model, and screw the clock movement fast to
the lower side of the plate _A_. The parts _T_, Fig. 33, are alike on
both pivots.

[Illustration: Fig. 32]

[Illustration: Fig. 33]

PROFITABLE FOR EXPLAINING TO A CUSTOMER.

To fully appr