Improvements in or connected with Weighing and Testing Machines.
Year: 1899

page_text: Date of Application, 23rd June, 1899
Date of Application, 23rd June, 1899
Complete Specification Left, 13th Mar., 1900-Accepted, 14th Apr., 1900
PROVISIONAL SPECIFICATION
Improvements in or connected with Weighing and Testing Machines.
I, GEORGE HENRY DENISON, of Hunslet Foundry, Leeds, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to the weight indicating portion of such machines as
are self-acting or partially so, and it is intended to be used, preferably, in con-
junction with the arrangement of weighing machines for which Letters Patent
were granted to the present applicant in 1896, No. 3460, and in which a
mercurial balance, augmented by a steadying device, and a scale-magnifier
(having mechanical limbs) were the chief features.
The object of the invention is to introduce a scale-magnifier which shall
reduce all friction to a minimum, with a steadying device (preferably regulat-
able at any time) which shall minimise oscillations and allow the reading to be
promptly taken.
This
I carry out my object as follows:-First I arrange that an increase of weight
on the weigh-table shall, by preference, depress a plunger in the mercury, both
the plunger and the sides of the vessel being parallel. Connected with this first
vessel is a second vessel, likewise with parallel sides, the communication between
the two being arranged at the foot, through an adjustable passage.
adjusting device is used for steadying the flow of the mercury from one to the
other. The upper part of the second vessel is covered by a water-tight gland
which supports a glass tube of suitable length and comparatively small diameter.
The glass tube is filled with coloured water (or the like) which depresses, and
is supported by, the surface of the mercury in the second vessel.
Mercury being some 13½ times heavier than water it follows that any variation
of the surface level of the mercury in the first vessel-due to the action of the
load upon the plunger-is transmitted to the depressed level of the mercury
in the second vessel and proportionately alters the overhead surface of the
coloured fluid in the glass tube."
In some cases a light float in the tube may be made to register the maximum
rise where circumstances render this desirable.
Means for supplying extra fluid to the tube, and drawing off any superfluity,
may be arranged.
A suitable scale (adjustable if desired) is mounted at the side of the glass tube.
Dated this 22nd day of June 1899.
WM. SNOWDON,
Agent for the Applicant,
4, Basinghall Street, Leeds, Yorks.

page_text: Improvements in or connected with Weighing and Testing Machines.
GEORGE HENRY DENISON, Hunslet Foundry, Leeds, Yorks, Machine Maker,
do hereby declare the nature of this invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:-
This invention is a modification of the arrangement of weighing machine
indicator for which Letters Patent were granted to the present applicant
numbered 3460 of 1896 in which a mercurial balance and a scale magnifier
(having mechanical limbs) were the chief features.
The object of this invention is to introduce a scale magnifier which shall
reduce friction to a minimum with a steadying device (preferably regulatable)
which shall minimise oscillations and allow the reading to be promptly taken.
I carry out my object as follows. I arrange that an increase of load on the
weigh table shall either depress or lift a plunger which works in a bath of
mercury as described in my specification numbered 3460 of 1896. The bath of
mercury is connected with a second vessel or chamber by means of an adjustable
passage in its lower part. The second chamber has parallel walls and is fitted
with a gland at its upper end in which is fixed a glass tube of small diameter
in such a way as to make a water-tight joint. The glass tube is in free com-
munication with the second chamber and is open to the atmosphere at the top.
The glass tube and the upper part of the second chamber contain coloured
water (or the like) which is supported by the mercury in the lower part.
Mercury being some thirteen and a half times heavier than water, it follows
that any variation of the surface level of the mercury in the first vessel due to
the action of the plunger, is transmitted to the mercury in the second vessel
and proportionally alters the surface level of the coloured fluid in the glass tube.
In order to describe my invention fully I have annexed hereto two sheets of
drawings. Fig. 1 is a front elevation of such parts of a weighing machine as
are necessary to an understanding of the mode of carrying out my invention,
the device being shown attached to the secondary. pillar. Fig. 2 is an end
elevation of the same. Fig. 3 is an enlarged sectional elevation of the mercury
bath and plunger with the improved scale magnifier now to be described and
Fig. 4 is a plan of the same. The parts are correspondingly lettered in all
the figures.
A is the steelyard whose fulcrum B sits in pillar B₁ sliding weights C and C¹
may be fitted as usual. At the free end of the steelyard is fitted a link D to
which is attached the plunger E working in the mercury bath F which is fixed
to the secondary pillar G. H is the second chamber communicating with F
by the passage K. The glass tube I is fixed in the gland J.
L is an index plate from which the height of the column of fluid (and there-
fore the load on the weigh table) may be read. M is a screwed plug which may
be used to check the flow of mercury through the passage K.
Means for supplying extra fluid to the tube and drawing off any superfluity
is provided by a screw N working through a gland which forms a pocket or
reservoir attached to the second chamber.
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:-
In a weighing or testing machine using a bath of mercury as a resistance.

page_text: the combination of a second and communicating chamber, containing and sup-
porting a column of relatively light fluid, for the purpose set forth, substan-
tially as herein described and shown on the drawings."
Dated this Ninth day of March 1900
GEORGE HENRY DENISON.