Year: 1886

page_text: I SYDNEY PITT of Sutton in the County of Surrey Gentleman do hereby declare
the nature of this invention (a communication to me from abroad by Jean Jacques
Auguste Aubert of Lausanne in the Republic of Switzerland Watch maker) and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
.
The object of the invention is the construction of an apparatus capable of
measuring and registering the duration of the passage of an electric current.
This result is obtained in a very simple, very portable and very economical form
by means of the instrument represented in the annexed drawings. As will be
seen the pendulum of the movement is governed by a small electro-magnet worked
by the electric conductor. When the current passes the armature attracted by the
electro-magnet releases the pendulum of the clockwork movement which com-
mences to run and measures the exact duration of the passage of the current but
when the latter is interrupted the armature being pulled by a spring and being no
longer attracted by the electro-magnet resumes its original position and the clock
is stopped.
This apparatus shows at a glance the number of hours and minutes during
which the current has been used.
The annexed drawings are twice the natural scale.
Figure 1 shows a front view of the meter with its four small dials at the centre.
The dial M shows the minutes, the dial U the hours, the dial D the tens of hours
and the dial C the hundreds of hours.
a is the square spindle by which the clockwork is wound up-The plates b b
fixed to the case r are for fixing the meter in any convenient place.
Figure 2 is a section of the apparatus on line x x Figure 4-c is a ratchet
wheel with its ratchet e fixed on the square ended axis a-d is the cylinder in
which is placed the main spring and which gives motion to the wheels and pinions
of the train which turns the hands of the four dials.
Figure 3 is a section on y y Figure 4 and shows the arrangement of the train
and the anchor g provided with a pendulum h which governs its motion.

page_text: Figure 4 is a side view of the mechanism of the meter-o is an enamelled face
which carries the dials. p is a sheet of glass which protects the hands. At the
side of the frame is fixed an electro magnet i (Figure 3) traversed by the electric
current. The armature fis pivotted at the point k and is pressed by the spring
against the anchor g to stop it.
When the current passes, this armature is attracted by the bobbins and the
anchor being freed the pendulum which was held in an oblique position puts itself
in motion.
•
The plate m at the back is made of insulating material-On this plate are
screws n and n¹ which receive the ends of the wires q' q¹ of the electro magnet.
To these screws are fixed the wires coming from the lamp for example which
convey the current whose duration is to be measured. The box r in which the
mechanism is enclosed is provided with two holes for the wires and its back 8 can
easily be taken off to allow the connections to be made.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
The construction of a meter for measuring the duration of the passage of an
electric current consisting of the combination of an electro magnet worked by the
current with a clockwork movement substantially as described and shown.
Deted thin 90th day of Iul 1986