upon the tool,
allowing it to rest upon the leg B, and set the pivot D in the foot
jewel. Now adjust, by means of the screw C until the roller is in its
proper position in relation to the lever fork. This may be understood
better by consulting Fig. 8, where A is the gauge, C is the roller, E is
the lever, F is the plate and G is the potance.

[Illustration: _Fig. 8._]

Now in order to locate the proper place to cut the seat for the roller,
remove it from the foot of the gauge and apply the gauge to the work as
shown in Fig. 9. The foot of the gauge resting against the end of the
pivot, the taper end of the gauge will locate accurately the position of
the roller seat. In order to locate the proper position for the seat for
the balance, proceed the same as for the roller, except that the foot of
the gauge is lowered until it is brought sufficiently below the plate to
allow of the proper clearance as indicated by the dotted lines at H. Now
apply the gauge to the new staff, as shown in Fig. 10, and the taper end
will locate the exact position for the balance seat.

[Illustration: _Fig. 9._]

[Illustration: _Fig. 10._]

As previously stated, I have taken it for granted that you preferred to
finish all the lower portion of the staff while the work was held in the
chuck. I have assumed that you prefer to work in this way because I have
noted the fact that nine watchmakers out of every ten start with, and
first finish up, the lower portion of the staff. Where this method of
working originated I do not know, but it always has the appearance to me
of "placing the cart before the horse." I do not pretend to say that a
true staff cannot be made in this way, but it certainly is not the most
convenient nor advisable. We all know that the heaviest part of the staff
is from the roller seat to the end of the top pivot. Now it seems to me
that it is the most natural thing in the world for a mechanic to desire
to turn the greater bulk of his work before reversing it. Now if the
workman has been educated to turn indifferently with right or left hand,
it may make little difference, as far as the actual turning is concerned,
whether he starts to work at the upper or lower end of the staff, but
unfortunately there are few among us who are so skilled as to use the
graver with equal facility with either hand, and it is therefore an
advantage to start with the upper end, as you can thus finish a greater
portion of the work more readily. Yo