AN IMPROVED METRONOME OR APPARATUS FOR MEASURING INTERVALS OF TIME
Year: 1865

page_text: LETTERS PATENT to Henry Carnegie, Carden, of No. 24, Rue de
Dunkerque, Paris, in the Empire of France, for the Invention of "AN
IMPROVED METRONOME OR APPARATUS FOR MEASURING INTERVALS OF TIME."
Sealed the 9th February 1866, and dated the 11th November 1865.
PROVISIONAL SPECIFICATION left by the said Henry Carnegie Carden
at the Office of the Commissioners of Patents, with his Petition, on
the 11th November 1865.
I, HENRY CARNEGIE CARDEN, of No. 24, Rue de Dunkerque, Paris, in
the Empire of France, do hereby declare the nature of the said Invention
for "AN IMPROVED METRONOME OR APPARATUS FOR MEASURING INTERVALS OF
TIME," to be as follows:-
My Invention consists in a novel combination of mechanism applied. to
the construction of the instruments known as "metronomes," or apparatus
for measuring intervals of time, and especially intended to mark at will
in music the time of those notes only which are naturally accentuated.
Figure 1 of the accompanying Drawing is a front view of the me-
chanism; Figure 2 is a vertical section of the same (side view); Figure 3
represents the indicator plate. In all these Figures similar parts of the
mechanism are indicated by the same letters of reference.

page_text: a, a, a, a, are two plates enclosing the different parts of the apparatus,
and separated from each other by the pillars b, b, b, b; c is the suspension
plate of the pendulum rod; d is a double or anchor-shaped lever, similar
to that used in certain kinds of clocks or timepieces; e is the escapement
wheel carrying eighteen teeth; f is a ratchet wheel with nine teeth and
nine spaces, mounted paralelly to the wheel e, the required separation
between the two faces being maintained by the pillars g, g, by which both
wheels are connected together; h, h, is an intermediate toothed wheel
cogging with the pinion i of the escapement e; j,j, is another toothed
wheel mounted on the barrel k, k, in which is coiled the motive spring
as in ordinary timekeepers; this wheel j, j, cogs with the pinion of the
intermediate wheel h; m is the arbor of the barrel wheel; n is the arbor
of the anchor d; o, o, o, are the bearings of the different arbors formed
in the back and front plates of the apparatus; p, p, is the pendulum
rod; q, q, is the fork; r, suspension of the pendulum rod; s, suspension
of the fork q; t is the arbor of the rocking lever u, the upper or beak-
shaped extremity of which acts on the ratchet wheelf, while to the lower
extremity is secured a fine thread ; x (Fig. 3) is a double plate, the
parallel surfaces of which are separated by pivot columns to the distance
of about one-fifth of an inch; y is the indicator, formed of any suitable
light material (such as the barb of a feather), the stalk of which passes
into the spiral spring z. The plate (Fig. 3) being placed in any
required position is connected by means of the thread with the foot of
the rocking lever u of the main apparatus (Fig. 1, 2).
enclosed in the barrel k being wound up, the motion is
wheels h, f, and e, to the anchor d, the pendulum p, and the fork q
During this movement the rocking lever u, cogging by its upper end on
the ratchet wheel f, draws backwards and forwards the thread v attached
to its lower extremity, and communicates the required motion to the
indicator y, which thus marks the time according to the rise or fall o
the pendulum. When so desired, a pair of chimes or other sounding
mechanism may be applied to the apparatus, and acted on by a cross ba
or other equivalent arrangement attached to the pendulum rod.
The mainspring
imparted to the

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Carnegie Carden in the Great Seal Patent
Office on the 16th April 1866:
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
CARNEGIE CARDEN, of No. 24, Rue de Dunkerque, Paris, in the Empire
of France, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of November, in the year of our
Lord One thousand eight hundred and sixty-five, in the twenty-ninth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Henry Carnegie Carden, Her special licence that
I, the said Henry Carnegie Carden, my executors, administrators, and
assigns, or such others as I, the said Henry Carnegie Carden, my exe-
cutors, administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "AN IMPROVED
METRONOME OR APPARATUS FOR MEASURING INTERVALS OF TIME," upon the con-
dition (amongst others) that I, the said Henry Carnegie Carden, my
executors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the same
was to be performed, and cause the same to be filed in the Great Seal
Patent Office within six calendar months next and immediately after the
date of the said Letters Patent.
NOW KNOW, YE, that the said Henry Carnegie Carden, do hereby
declare the nature of my said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by
the following statement, reference being had to the Figures of the annexed
Drawing; and to the letters marked thereon, that is to say :-
My Invention consists in a novel combination of mechanism applied to
the construction of the instruments known as "metronomes," or apparatus
for measuring, intervals of time, and especially intended to mark at will
in music the time of those notes only which are naturally accentuated.
Figure 1 of the accompanying Drawing is a front view of the mechanism';
Figure 2 is a vertical section of the same (side view); Figure 3 represents
the indicator plate. In all these Figures similar parts of the mechanism
are indicated by the same letters of reference.

page_text: a, a, a, a, are two plates enclosing the different parts of the ap-
paratus, and separated from each other by the pillars b, b, b, b; c is the
suspension plate of the pendulum rod; d is a double or anchor-shaped
lever, similar to that used in certain kinds of clocks; e is the escapement
wheel carrying eighteen teeth; f is a ratchet wheel with nine teeth and
ninė spaces mounted parallely to the wheel e, the required separation
between the two faces-being maintained by the pillars g, g, by which
both wheels are connected together; h, h, is an intermediate wheel,
cogging with the pinion i of the escapement e; i, j, is another toothed
wheel mounted on the barrel k, k, in which is coiled the motive spring
as in ordinary timekeepers; this. wheel j, j, cogs with the pinion. of
the intermediate wheel h; m is the arbor of the barrel wheel; n is the
arbor of the anchor d; 0, 0, 0, 0, are the bearings of the different
arbors formed in the back and front plates of the apparatus; p, p, is the
pendulum rod; q is the fork; r, suspension of the fork g;t is the
arbor of the rocking lever u, the upper or beak-shaped extremity of which
acts on the ratchet wheel f, while to the lower extremity is secured a fine
thread ; (Fig. 3) is a double plate, the parallel surfaces of which are
separated by pivot columns to the distance of about one-fifth of an inch;
y is the indicator, formed of any suitable light material (such as the barb
of a feather), the stalk of which passes into the spiral spring 2.
plate
by
The
x, x, Fig. 3, being placed in any required position is connected
means of the thread with the foot of the rocking lever u. of the
main apparatus, Figs. 1, 2. The mainspring enclosed in the barrel k
veing wound up, the motion is imparted to the wheels h, f, and e, to
the anchor d, the pendulum p, and the fork. q. During this movement,
the rocking lever u cogging by its upper end on the ratchet wheel
draws backwards and forward the thread attached to its lower extremity,
and communicates the required motion to the indicator y, which thus
marks the time according to the rise and fall of the pendulum. When so
desired, a pair of chimes or other sounding mechanism may be applied to
the apparatus, and acted on by a cross bar or other equivalent arrangement
attached to the pendulum rod.
The apparatus constructed as above is, as before stated, especially
intended for marking time in music, but it is obvious that by slight modifica
tions in the details of form and arrangement the same mechanism may
be applied to the construction of alarm clocks and other instruments for
the measurement of intervals of time.
Having now described the nature of my said Invention, and the manner
L

page_text: of carrying it into effect, I declare that what I claim as my improvement
in the construction of metronomes, and desire to protect by Letters Patent,
is, the combination of the ratchet wheel f, mounted on an escapement
wheel e, with the rocking lever u, the thread v, and the spiral spring z,
in manner and for the purposes substantially as herein set forth and shewn
in the Figures of the annexed Drawing,
In witness whereof, I, the said Henry Carnegie Carden, have hereto
set my hand and seal, this Twelfth day of April, in the
year
Lord One thousand eight hundred and sixty-six.
H. C. CARDEN. (L.S.)