IMPROVEMENTS IN AUTOMATIC REVOLUTION INDICATORS
Year: 1881

page_text: LETTERS PATENT to Friedrich Hermann Felix Engel, Civil Engineer and
Patent Agent, in the City of Hamburg, Germany, for an Invention of
"IMPROVEMENTS IN AUTOMATIC REVOLUTION INDICATORS." A communication
from Julius Eggers, of Hamburg, in the German Empire.
PROVISIONAL SPECIFICATION left by the said Friedrich Hermann Felix
Engel at the Office of the Commissioners of Patents on the 17th October
1881.
"
FRIEDRICH HERMANN FELIX ENGEL, Civil Engineer and Patent Agent, in the
City of Hamburg, Germany. IMPROVEMENTS IN AUTOMATIC REVOLUTION
INDICATORS." A communication from Julius Eggers, of Hamburg, in the German
Empire.
These improved indicators are constructed for the purpose of producing diagrams
by graphic indication of a pin, needle, or other indicating device, showing the
maximum number of revolutions attained by wheels, discs, or other revolving
mechanical elements.
This improved instrument may also be put in connection with a clock-work, and
a revolving motion may be given to the paper or other object for receiving the
marking of the pin or needle, so as to produce diagrams consisting of curves, which
show the velocity or number of revolutions in comparison with the time during
the operation of the apparatus.
The apparatus consists in its main parts of a metallic casing, preferably made of
cylindrical shape, furnished with top and bottom covers, of a spiral spring placed
on the bottom of the cylinder, and of a weight placed on the top of the spring
and guided in the cylindrical or otherwise shaped casing by rods projecting from
the ends of the weight and passed through top and bottom cover. At the front or
at the sides of the casing a straight-lined opening or slot is formed to same, and a
[Price Gd]

page_text: pin fastened to the weight projects from this slot and moves downward or upward
in this slot when the spring is compressed or released.
The casing is enclosed in and fastened to the inner hinder side of a square or
other shaped box furnished with a door in front of the indicating pin. To the
inner side of this door a paper, card-board, or other material used for receiving the
indicating diagram is attached, and is by means of a spring slightly pressed
against the point of the pin; or the paper or card board may be fixed to the door
without the intermediate spring, and the pin may, instead of being a fixture to the
weight, be placed moveably in a boring of the weight and be slightly pressed
against the paper by a spiral spring or other elastic medium placed inside the boring
and underneath the pin.
For taking diagrams the apparatus is fastened to the disc, wheel, shaft, or other
going part from which diagrams have to be taken, at a certain distance from the
centre thereof, and after the disc, wheel, shaft, or other going part has been put in
rotation in consequence of the centrifugal action, the weight compresses the spring
more or less according to the velocity attained by the disc, wheel, shaft, or other
going part, and the pin that follows the movements of the weights indicates a
straight line on the paper or material used, and the length of the line compared to
a scale shows the maximum number of revolutions attained by the wheel during
the operation.
If the apparatus is brought in communication with a clock-work revolving with
the disc, wheel, shaft, or other going part, and the paper or material used for
receiving the indicating diagram is put in rotation by the clock-work, and instead
of a straight line, as before described, a curved line appears on the paper and shows
the number of revolutions attained at any time during the operating of the
apparatus.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Friedrich Hermann Felix Engel in the Great Seal Patent Office on
the 17th April 1882.
FRIEDRICH HERMANN FELIX ENGEL, Civil Engineer and Patent, in the
City of Hamburg, Germany. "IMPROVEMENTS IN AUTOMATIC REVOLUTION
INDICATORS." A communication from Julius Eggers, of Hamburg, in the German
Empire.
These improved indicators are constructed for the purpose of producing diagrams
by graphic indication of a pin, needle, or other indicating device, showing the
maximum number of revolutions attained by wheels, discs, or other revolving
mechanical elements. This improved instrument may also be put in connection
with a clock work, and a revolving motion may be given to the paper or other
object for receiving the marking of the pin or needle, so as to produce diagrams
consisting of curves which show the velocity or number of revolutions in com-
parison with the time during the operation of the apparatus.
The apparatus consists in its main parts of a metallic casing, preferably made of
cylindrical shape, furnished with top and bottom covers, of a spiral spring placed
on the bottom of the cylinder, and of a weight placed on top of the spring, and
guided in the cylindrical or otherwise shaped casing by rods projecting from the
ends of the weight and passed through top and bottom cover.
At the front or at
the sides of the casing a straight lined opening or slot is formed to same, and a pin
fastened to the weight projects from this slot and moves downward or upward in
this slot when the spring is compressed or released.
The casing is enclosed in and fastened to the inner hinder side of a square or
other shaped box furnished with a door in front of the indicating pin. To the
inner side of this door a paper, card board, or other material used for receiving the
indicating diagram is attached, and is by means of a spring slightly pressed
against the point of the pin; or the paper or card board may be fixed to the door
without the intermediate spring, and the pin may, instead of being a fixture to the
weight, be placed movably in a boring of the weight and be slightly pressed against
the paper by a spiral spring or other elastic medium placed inside the boring and
underneath the pin.
For taking diagrams the apparatus is fastened to the disc, wheel, shaft, or other
going part from which diagrams have to be taken at a certain distance from the
centre thereof, and after the disc, wheel, shaft, or other going part has been put in
rotation in consequence of the centrifugal action, the weight compresses the spring
more or less according to the velocity attained by the disc, wheel, shaft, or other
going part, and the pin that follows the movements of the weight indicates a
straight-line on the paper or material used, and the length of the line compared to
a scale shows the maximum number of revolutions attained by the wheel during
the operation.
If the apparatus is brought in communication with a clock-work revolving
with the disc, wheel, shaft, or other going part, and the paper or material used for
receiving the indicating diagram is put in rotation by the clockwork, and instead
of a straight line, as before described, a curved line appears on the paper and
shows the number of revolutions attained at any time during the operating of the
apparatus.
In the accompanying Sheet of Drawings, Figs. 1, 2, and 3 represent respectively
longitudinal section, front plan with the door of the casing of such, and ground
plan in section of an apparatus constructed according to these improvements.
Figs. 5, 6, and 7 represent this instrument in connection with a clock-work, and
Figs. 4 and represent modes of attaching the instrument to the discs of fly
wheels, spokes of wheels, or such like revolving elements.

page_text: A is the casing furnished with top and bottom plates containing a weight w
supported by a spring s and guided in the bottom and top of the casing by rods 1
projecting from the outer ends of the weight; c is an upright slot formed in the wall
of the casing, and p represents the registering pin or pencil fastened to weight w;
R is a box receiving the instrument, and this box can be locked or otherwise
closed, and to the inner side of the door of this box a strip of paper d, or other
suitable material for receiving the indicating diagram is attached and is by spring n
slightly pressed against the point of pin p.
Screws o; o, are applied for fastening the box R to the revolving element E, and
when at work weight w by centrifugal action compresses the spring s more or less
according to the number of revolutions given to the element. Pin p slides at same
time in slot c and marks a straight line on paper d, from the length of which the
maximum number of revolutions attained can be found by experiments or by a
scale attached to the sides of the paper. If, for example, the maximum number of
revolutions allowed to a wheel be 200, a mark can be made on the paper or near
the side of this paper corresponding to the position of the point of pin p at this
number of revolutions. If the apparatus after use shows a prolongation of the
diagram line of pin p proceeding above this mark, it will directly be proved
that the maximum velocity allowed to the wheel or revolving element has been
surpassed.
By enclosing a clock-work D in box R of the apparatus, as is shown in Figs. 5,
6, and 7, and by moving a strip of paper v or a circular registering roller by this
clock, the apparatus, if attached to the spokes or other parts of a wheel E, can be
employed to register the velocities of the corresponding waggon or locomotive in
comparison to the intervals of time. This combination allows of constructing an
apparatus for registering the velocities of a train or waggon, etc., without using
any transmissions or intermediate shafts by merely fastening it to the nave or to
the spokes of a wheel of such locomotive or waggon.
To protect the clock-work when revolving with the wheel to which it is
attached against the damaging influence of the centrifugal action, it is desirable to
place all shafts or axles of the clock-work radially as far as possible.
It is also preferred to use a double crank ff', and a pin and slot (see
Figures 5, 6, and 9) for transporting the motion of the clock to the shaft of the
paper roller.
Having now described the nature and particulars of the said Invention, I
claim,―
Firstly. A revolution indicator consisting essentially of a casing A enclosed in
box R, a weight w with indicating pin p, a spiral spring 8, and a paper d or other
suitable material for receiving the indicating mark of pin p when the apparatus is
put in revolution, constructed and operating substantially as herein described and
explained in reference to and shown by the Figures 1, 2, 3, and 4 of the accom-
panying Sheet of Drawings.
Secondly. The combination of a clock work enclosed in box R for attachment,
and pin p for indicating the velocities of the wheel in comparison to the time on a
strip of paper or on a cylinder revolving with the apparatus and driven by the
above clock work, substantially as and for the purpose herein described, and as
illustrated by Figs. 5, 6, and 7 of the accompanying Sheet of Drawings.
In witness whereof, I, the Friedrich Hermann Felix Engel, have hereunto
set my hand and seal, this Eleventh day of April, in the year of our Lord
One thousand eight hundred and eighty-two.