Part III
CHAPTER TWO Position Adjusting The
first portion of this chapter treats on position error
as related solely to the balance spring and of the effect of
gravity which
most
coils.
is
is
such that a positive
produced.
from barrel
knows how
to
fection, there will
in
of this action
watch may be mechanically perfect
struction skill
an ever-present force acting upon the inner-
The nature
position error
A
is
to balance
make
it
may
—and
—that
is,
its
be as exact as
con-
human
such per-
yet, in spite of
be a variation of from 15 to 30 seconds
24 hours between some two
vertical positions
In watches that are
condition of the balance spring alone. less perfect the error is frequently as
due to the
high as 40 seconds or
more.
The Balance Spring and The
oscillation
Its Poise
of the inner portion of the spring cor-
responds very nearly to that of the collet travels three fourths of
a
collet
circle,
center travels nearly an equal distance.
;
when
the
first coil in
the
that
the It is
from the
movement ceases coils are marked
is,
further evident
that each of the several coils, as they tend to distant
Error
become more
center, will travel a shorter path until the
altogether at the regulator pins. in a straight line
140
from
If the
collet to regulator