278 On the stopping of Astronomical Clocks. 
scending eleven inches keeps it in motion a week. The 
pendulum is supported by a strong upright bar of steel. 
which also supports the pully, over “which passes the co 
which suspends the weight. 
This clock I found frequently to stop when the weight 
descended nearly opposite to the pendulum from which it 
was then distant about three fourths of an coal bis 1 
attributed to the attraction of the weight and ulum, 
and determined to remove the weight to a greater distaibe. ; 
Before this was done, however, on attentively observing 
the clock, | found that before it stopped, the weight acquir- 
ed a considerable oscillation, evidently communicated 
from the pendulum through the common support. 
“ destroy these oscillations, | placed a perpendicular 
by the side of the weight, the whole line of its de- 
. On this a ring was fitted to slide, and was connect- 
th the weight by a delicate spring. This spring by 
constantly pressing the weight towards one side prevented 
the oscillations from taking place and completely effected 
the object, and the clock has since continued to go withou! 
any interruption. 
The experiment has been often repeated, of supporting 
two clocks on the same horizontal beam. If one be set m 
motion it wil] in a short time communicate its motion te 
the other, and if both pendulums be of the same length. 
they will continue their beats with perfect isochronism. 
| This sympathy, which also exists between two weatiy bal- 
oe ances which are supported by the same plates, b 
or ingeniously used in practice by Breguet, wh 
tches, each including 
= oe 
ASS a 
nd the weight; 3: 
cord becomes a 
