Yuku free message boards

Britten says, it should be remembered that if the vibrations of a balance
are to be isochronous the impulse must be delivered in the middle of it*
ribration, and that therefore no spring will be satisfactory if the escape-
ment it defective in this particular.

The recognized authorities conflict considerably in their various theo-
ries in regard to adjustment to isochronism and particularly in regard to
the length of spring. Immisch says that mere length has nothing to do
with isochronism. Glasgow contends that length has everything to do
with it, and that a spring too short, whatever its form, would make the
short arcs of the balance vibration be performed in a less time than the
long arcs, and a spring too long would have just the contrary effect.
Charles Frodsham advanced the theory that every length of spring has
its isochronous point. Britten declares the length is all important; that
a good length of spring for one variety of escapement is entirely unfitted
for another variety. Saunier says that the discussion of the question
whether short springs are preferable to long ones it a mere waste of

time and can result in no
good. In horology every-
thing must be relative.
Whatever be the escape-
ment under considera-
tion, it requires neither
a long nor a short hair-
spring, but one that is
suited to its nature and
mode of action, that is to
say, the lengi h must bear
a definite relation to the
extent of the arcs of
vibration, etc.

Owing to the conflict
of opinion it is advisable
that the student read the
various arguments set
forth in the works re-
ferred to above and form
his own conclusions.