109 and
111. These pillars furnish support for sliding centers which hold the
top pivots of the escape wheel and pallet staff while we are testing the
depths and adjusting the pallet stones. It will be understood that these
pillars _D E_ are at right angles to the plane of the bed _B_, in order
that the slides like _G N_ on the pillars _D E_ move exactly vertical.
In fact, all the parts moving up and down should be accurately made, so
as not to destroy the depths taken from the watch plate _A_. Suppose, to
illustrate, that we place the plate _A_ in position as shown, and insert
the cone point _n_, Figs. 109 and 112, in the pivot hole for the pallet
staff, adjusting the slide _G N_ so that the cone point rests accurately
in said pivot hole. It is further demanded that the parts _I H F G N D_
be so constructed and adjusted that the sliding center _I_ moves truly
vertical, and that we can change ends with said center _I_ and place the
hollow cone end _m_, Fig. 112, so it will receive the top pivot of the
pallet staff and hold it exactly upright.
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