A NEW AND USEFUL IMPROVEMENT IN CHRONOGRAPH-WATCHES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Adrien Aubert at the Office of the
Commissioners of Patents on the 3rd September 1883.
ADRIEN AUBERT of Sentier Switzerland "A NEW AND USEFUL IMPROVEMENT
IN CHRONOGRAPH-WATCHES
"
The object of my Invention is to obtain by means of mechanism of the utmost
simplicity a minute meter working with absolute and unfailing exactness.
Fig one of the drawing shows a vertical section of the mechanism of a chronograph
with minute ineter the hands of which as well as those of the hours and minutes
revolve round the centre of the watch
Fig 2 represents the same mechanism of chronograph in which the meter hand is
arranged in a special dial indicating the minutes and placed for instance between
the centre and the edge of the watch
In both the figures the same letters refer to the same parts
My Invention consists of the appliance to the chronograph with minute meter of
an intermediate movement E. D. similar to the minute works which regulate in
common watches the step of the hour and minute hands the use of which is to
regulate the motion of the hand J of the minute meter in relation to the hand K. of
the chronograph
Description of figure 1. The pinion of the second wheel S carries a wheel with
fine teeth M which engages with the wheel L the latter actuates the wheel A of
the chronograph The wheel A provided with a set heart G is fixed to the axis B
bearing the pinion C. The latter impels the wheel of the meter F through the
medium of the wheel D and the pinion E which are arranged in such a manner as
to make the hand J advance by one minute at every complete turn of the hand of
the chronograph K
The wheel of the meter F turns freely upon the cannon h fixed to the set heart H
with which it is connected by smooth friction by means of a small spring g¹ which
is secured to the central boss f of the wheel F and which rubs against the cannon h
whilst it enters into an opening made in the boss f
The result of this arrangement is that the wheel F impels the cannon h and
consequently the hand J during the action of the chronograph and meter but the
cannon h and the hand J may turn in one direction or another independently of the

page_text: wheel F when the set lever strikes against the heart H. The cannon H revolves
within a cannon x which is fixed to the bridge X.
Around the cannon x is placed the minute wheel P provided with a cannon p
which carries the minute hand R.
The minute works O transmit the motion they receive from the second wheel of
the watch mechanism either to the minute wheel P or to the cannon wheel N
which carries the hour hand.
Description of figure 2. The mechanism represented in this figure is similar to
that of the fig 1 in as far as the principle of the mechanism itself is concerned the
only difference being the arrangement of the hands.
The axis H of the hand of the meter is placed in the centre of a dial situated
between the middle and the edge of the watch. The wheel of the meter F is fixed
to the axis H' and engages as in the former case with the pinion E. The hand J
of the meter is fixed to the cannon of the heart H which freely turns upon the
axis H¹.
A small friction spring g fixed to the heart H penetrates into a groove made in
the rod H. By means of this arrangement the hand J is set in action by the latter
when the wheel F turns but the hand J may nevertheless revolve independently of
the wheel F either in the one direction or the other when the heart H is made to
act through the set lever