1 1 
of a new Pendulum. 
projecting backwards to such a distance as to carry a tube fixed 
to it CC so far back, and in such direction, as to exactly coincide 
on its inside with the cylinder formed by the semicircular cavity 
in the frame GG, fig. 2, and the cylindric part of the piece KK, 
so that if they were continued they would form the same cy- 
linder when the screws L L, fig. 2, are screwed home. This 
tube is made exactly to fit the tube I I, in the same manner 
that the outer brass tube of a telescope is fitted to the inner 
one. This tube CC is split open on one side, and is of such a 
degree of elasticity as to open when left to itself at this slit, so 
as to leave the tube I I entirely free. To the frame B is fitted 
a piece D, which consists of two semicylinders, connected to- 
gether by one being screwed to the piece B at E, the other to 
the frame B at E on the other side. They are also connected 
by a part F, where they can be brought together or separated 
by the screw G. Now if the screw G be undone, then the two 
semicylinders will separate from one another, and allow the tube 
CC to open by its elasticity, and the tube I I to be at perfect 
liberty in expanding upwards or downwards. But if the screw 
G be screwed home, then the two sides of the piece F will 
embrace the tube C, and shut it upon the tube I, so that it 
shall become fixed at this point. This apparatus may be placed 
any where between B and I, fig. 1. In the clock I have con- 
structed, it is placed at the point F opposite to E, fig. 1. 
If the point I be placed then too high, the clock will be 
found to go too slow if the heat be greater, too fast if it be 
less. If this should be found the case, then the screw G, fig. 
3, is to be screwed home, the screws L L, fig. 2, are to be 
loosened, and the frame GGGG must be screwed downward 
by the screw H, which will carry along with it the piece KK, 
C 2 
