92 Dent's new Compensation Balance for Chronometers. 
In figures 3 and 4, the compensation-weights are represented 
as moving in the plane of the balance ; but I produce a similar 
effect by causing the compensation-weights to move in a plane 
passing through the axis of motion; the mode of accomplishing 
which may be seen in the subjoined explanations. 
Fig. 5, represents a balance formed according to this mode. 
7, a compensation diameter bar, fixed on 
the balance axis; it is composed of brass and 
steel, the latter being nearest the compensa- 
tion-weights. This bar carrying a weight upon 
an upright rigid support, is the only compen- 
sating power hitherto employed in chronome- 
ters. 
s, two blocks attached to the ends of the bar, 
to receive the secondary compensation-pieces. 
t, two secondary compensation-pieces, each 
constituted of two pair of laminz bent into the 
form of staples and riveted together, with the 
bows lying in opposite directions, one end of 
the laminz being fixed upon the block s, the brass being in the insides of the sta- 
ples, and the steel on the outsides. 
_ u, two pillars fixed on the end of the upper pieces of these lamine ; to carry 
the weights, these pillars are furnished with screws, on which the weights turn 
for adjusting their heights. 
v, the two adjustable weights. 
By this arrangement the weight always moves in a line nearly 
parallel to the axis of the balance. 
On elevation of temperature, the distance between each staple 
is increased in height, and by this means the compensation- 
weight is raised from the balance-bar ; under these circumstan- 
ces, the augmentation thus effected by my secondary compensa- 
tion enables the primary compensation to carry the weight over 
a greater space and with accelerated velocity, towards the centre 
of motion; the reverse effect of course taking place on a decrease 
of temperature. ‘This variation of velocity to and from the centre 
of motion, could not possibly be brought about if the weights 
were placed on the before-mentioned rigid immovable supports, 
at the extremities of the balance-bar, as is usually done in the or- 
dinary balances of this construction. 
It may be remarked, that the bows of the secondary compen- 
sation-pieces may stand across the length of the bar 7, obliquely, 
or at any angle, without varying the perpendicularity of the mo- 
tion of the weights. 
