IMPROVEMENTS IN SPEED AND PRESSURE RECORDING GAUGES
Year: 1881

page_text: LETTERS PATENT to Marmont Bryan Edson, of Brooklyn, New York, United
States of America, for an Invention of "IMPROVEMENTS IN SPEED AND
PRESSURE RECORDING GAUGES."
PROVISIONAL SPECIFICATION left by the said Marmont Bryan Edson at
the Office of the Commissioners of Patents on the 12th April 1881.
MARMONT BRYAN EDSON, of Brooklyn, New York, United States of America.
"IMPROVEMENTS IN SPEED AND PRESSURE RECORDING GAUGES."
This Invention relates to certain improvements in speed and pressure recording
gauges, and has for its chief object to obtain a constant indication and permanent
record of the speed of machinery.
For this purpose I combine with indicating and recording mechanism of usual
character devices to which rotary motion is imparted by connections between the
same and the machinery, and provide said devices with weights fitted for centrifugal
motion, and connected with the actuating rod of the indicating mechanism, whereby
the indicating hand and recording pencil are moved in unison with the centrifugal
motion of the weights.
My Invention comprises the combination of the aforesaid devices, the construction
and operation of which are as follows, viz. :-
The indicating and recording mechanism is substantially similar to that described
in the Specification of former Letters Patent, dated April 1, A.D. 1875, No. 1181,
and used for recording steam pressures.
I will therefore describe such mechanism only in a general way, and it is to be
understood that the indicating hand may be dispensed with, and the recording
pencil used alone if desired. On a suitable stand are fitted drums, which carry a
belt or strip of paper moved by clock work contained in a case and connected with
one of the said drums.
There is a rocking shaft actuating a hand by a toothed segment, and carrying
an arm, which gives movement to the pencil. There is also an alarm mechanism
provided with a stop lever moved by contact of an arm from a shaft, which is

page_text: fitted with an arm from which a rod depends, which rod is in connection with the
operating devices next described.
To the underside of the stand above mentioned is fixed a tubular post, carrying
at its upper end a loose pulley sustained by a collar, and at its lower end a flange
sleeve, which is loose upon the said post, and is sustained by two spring arms
connected with the loose pulley and the sleeve.
The sleeve extends below the end of the tubular post, and its central aperture is
formed with a ring flange, forming a guide for a rod which extends through.the
tubular post and the sleeve. The end of said rod is fitted with a circular disc
clamped between the lower end of the sleeve and a screw-cap on the sleeve, so that
the sleeve and rod shall rise and fall together.
The spring arms above mentioned are provided with balls at their mid-length.
Upon the tubular post is a fixed collar that limits the upward movement of the
sleeve on the said post.
The loose pulley is connected by a belt with the engine or machine, and thereby
rotation is given to the pulley, the sleeve, and the arms.
The balls on the spring arms will, in operation, be thrown out more or less by
centrifugal action. The sleeve and rod will be correspondingly moved, and the
indicating and recording devices will thus be operated.
I do not limit myself to the exact mechanism and connections described, as they
may be varied within the scope of my Invention.
The devices for obtaining centrifugal action may be of different construction
and the rod may be connected directly to the pencil arm, and the indicating hand
and dial may be dispensed with when not required to indicate the rate of speed.
This speed, indicator can be combined with pressure indicating and recording
instruments by placing the tubular post at one side of the centre of the base, and
extending the rod through the base to a pencil arm fitted for marking the speed
upon the paper or chart on which the pressure is recorded by a separate pencil in
the ordinary manner.
By this combination an instrument is obtained which furnishes separate records
of pressure and speed upon a chart graduated to indicate the time.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Marmont Bryan Edson in the Great Seal Patent Office on the
11th October 1881.
"
MARMONT BRYAN EDSON, of Brooklyn, New York, United States of America.
IMPROVEMENTS IN SPEED AND PRESSURE RECORDING GAUGES."
The object of my Invention is to obtain a permanent record of the speed of
machinery in connection with the record of steam or other pressure operating the
same.
For this purpose I combine with indicating and pressure recording mechanism
devices fitted for rotary motion by geared shafting or pulley connections to the
machinery, and provided with weights fitted for centrifugal motion. that are in
connection with the actuating rod carrying the spring-pencil-holder and pencil, by
which a record is made on the chart of the speed and variations of the same.
My Invention consists in the combination of devices, the construction and
operation of which are hereinafter set forth, reference being had to the accom-
panying Drawing forming part of this Specification.
In the Drawing Figure 1 is a front elevation of the gauge, and Figure 2 a side
elevation.
The same letters of reference indicate corresponding parts in each Figure.
The indicating and pressure recording mechanism is substantially similar to that
shown in the Specification of Letters Patent, No. 1181, A.D. 1875, granted to my
London agent as a communication from me.
I will therefore describe such mechanism only in general terms.
A is the base of the gauge, on which are fitted the supporting frame b and the
reels a, a, that carry a paper ribbon or graduated chart, upon which the tracings
of work done are made. One of said reels is operated by a worm gear from the
clock movement in case B, the charts being graduated to such intervals of time as
may be desired.
c is a rock-shaft actuating the hand d by a toothed segment, and
carrying an arm f that gives movement to the pencil-holder g. C is an alarm
mechanism provided with stop lever h that is moved by contact of arm i from
shaft c.
To the underside of stand A is fixed a flanged tubular post 1, Figure 2, carrying
near its upper end a loose pulley m sustained by a collar n, and near its lower
end a flanged sleeve o, which is loose upon the post, and is sustained by spring
arms that are connected with pulley m and sleeve o. The sleeve o extends
below the end of post 1, and its central aperture is constructed with a recess
forming a guide for a rod which extends through post and sleeve o.
The end of this rod is usually fitted with a disc or flange at bottom, so that the
sleeve and rod shall rise and fall together.
The spring arms p are provided with balls r, which may be adjustable on said
arms. Upon post is a fixed collar 8 that limits upward movement of sleeve o on
the post.
The pulley m is connected by a belt or by gearing with the engine or driving
shaft of the machinery, and thereby rotation is given to the sleeve o and arms p.
The balls upon the spring arms will, in operation, be thrown out more or less by
centrifugal action, and the sleeve o and the rod carrying a spring-pencil-holder o¹
in post will be correspondingly moved upward or downward, thereby operating
the indicating and recording devices.
I do not limit myself to the exact form of mechanism and connections described,
as it may be required to vary them within the scope of my Invention. .
The device for obtaining centrifugal action may be of varied construction, and

page_text: when it is only desired to have indications of rates or variations of speed by hand
and dial to a scale, and records of the same, the rod in post may be passed
upward through the centre of base A, and be so connected to an arm upon shaft c
as to operate the indicating hand, also the pencil-carrying-arm, and pass the same
across the receiving chart, making an accurate record of the speed attained. The
said charts are graduated to specific intervals of time, and the dial is graduated to
indicate the rate of speed.
In such a construction the actuating rod in post will be moved by the
centrifugal action of the arms p and balls operated by the pulley m or by gearing
when connection is made to any driving power.
A gauge of such a construction is obviously adapted for ascertaining the rate of
speed with which steamships or the rolling stock of railways are moving, as well
as the speed of ordinary machinery, and for securing permanent records of such
speed.
Having thus fully described said improvements, and shown how the same may
be conveniently and advantageously carried into practice, I claim as my
Invention,-
First. The pencil carrying rod and holder o¹ operated substantially as described
in combination with the mechanism of an indicating and recording gauge for the
purposes hereinbefore set forth.
Second. The actuating rod in post 1, operated substantially as described in
combination with. rock-shaft c, whereby hand d, arm f, and spring pencil holder g
are made to indicate and record the rates and variations of speed, as hereinbefore
set forth.
In witness whereof, I, the said Marmont Bryan Edson, have hereunto set my
hand and seal, this Twenty eighth day of September, in the year of our
Lord One thousand eight hundred and eighty one.
Witness,
GEORGE HASELTINE,
Counsellor at Law,
247, Broadway,
New York.
MARMONT B. EDSON. (L.S.)