Has anybody ever thought of lengthening the period of a vertical with a
pulley arrangement like a compound bow.  Seems to me that If you took
the basic LaCoste arrangement and fixed the spring where the weight
would ordinarily be, placed a multiple pulley from the spring to the top
point and then hung the weight on the cable to the pully, the period
would lengthen times the amount of the mechanical advantage.  Ideally
the best medium instead of rope would be flat metal tape.  The only
problem I see is friction in the bearings of the pulleys lowering the
sensitivity of the instrument.  Has this ever been done?

=20

John Nelson















Has anybody ever thought of lengthening the period of =
a
vertical with a pulley arrangement like a compound bow.  Seems to =
me that
If you took the basic LaCoste arrangement and fixed the spring where the =
weight
would ordinarily be, placed a multiple pulley from the spring to the top =
point
and then hung the weight on the cable to the pully, the period would =
lengthen
times the amount of the mechanical advantage.  Ideally the best =
medium
instead of rope would be flat metal tape.  The only problem I see =
is
friction in the bearings of the pulleys lowering the sensitivity of the
instrument.  Has this ever been done?

 

John Nelson