IMPROVEMENTS IN STEELYARDS A
Year: 1882

page_text: LETTERS PATENT to Alfred Julius Boult, of the firm of W. P. Thompson
"
& Boult, Agents for Foreign Patent Solicitors, of 323 High Holborn London
in the County of Middlesex and 6 Lord Street, Liverpool, in the County
of Lancaster for an invention of IMPROVEMENTS IN STEELYARDS
A com-
munication from abroad by Pierre Arnaud and Léon Gaytté both of La Ciotat
in the Republic of France
PROVISIONAL SPECIFICATION left by the said Alfred Julius Boult at the
Office of the Commissioners of Patents on the 30th March 1882.
ALFRED JULIUS BOULT, of the firm of W. P. Thompson & Boult Agents for
Foreign Patent Solicitors of 323 High Holborn, London in the County of
Middlesex, and 6 Lord Street Liverpool, in the County of Lancaster, " IMPROVE-
MENTS IN STEELYARDS [A communication from abroad by Pierre Arnaud and
Léon Gaytté both of La Ciotat in the Republic of France]
"
This invention consists of a graduated bar or scale beam upon which slides a
movable box carrying an indicator to show its position upon the scale. Knife
edges upon the box carry hooks or equivalent, one above by which the whole
apparatus is hung and one below upon which the load is hung.
:
A supplemental scale is also provided in or upon the box and being arranged in
proximity to the main scale gives the finer divisions. A suitable balance weight is
fixed at one end of the scale beam.
When no load is on and the sliding box is moved up till the index is at the zero
point, the whole is in equilibrium but when a load is applied the scalebeam must
be drawn out until equilibrium is restored when the graduated scales will give the
weight of the load.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Alfred Julius Boult in the Great Seal Patent Office on the
30th September 1882.
ALFRED JULIUS BOULT of the firm of W. P. Thompson and Boult, Agents for
Foreign Patent Solicitors, of 323 High Holborn, London, in the County of
Middlesex and 6 Lord Street, Liverpool in the County of Lancaster
"
"
'IMPROVE-
MENTS IN STEELYARDS A communication from abroad by Pierre Arnaud and
Léon Gaytté, both of La Ciotat, in the Republic of France
This instrument will be best understood by reference to the accompanying
drawings which represent a side elevation, and a vertical section upon line Y, Z,
A is a box with reduced cheeks or sides and carrying the knife edges P.
B is the beam or movable rod sliding in the box A,
C counterweight,
Da roller supporting the beam
Fa brake which keeps the beam in any given position.
G sight holes in the cheeks provided with a graduated scale FT.
I and J arc hooks,
K indicator showing the graduations on the beam and fixed on the box A.
The graduation begins with zero whatever the load may be and is continued on
the scale to the maximum load for which the steelyard is calculated. The zero line
is set off so as to be in line with the edge m n of the indicator at such time as the
counterweight, which is fixed, balances the part of the beam which extends at the
other end, of the box A when no weight is upon the hook J.
If starting from this initial position the rod is caused to slide, the divisions
marked on the instrument will successively pass under the edge m n and thus the
exact number of the principal units of weight is obtained. As to the subdivisions
they are obtained directly by means of the scale fixed on the box and which is
always in contact with the graduated part of the rod. Thus the weight in say
Kilogrammes and hectogrammes (though of course other divisions of the scale may
be used) is obtained by one operation
By this construction not only is the starting point always zero but morcover the
counterweight is so attached to the rod as to prevent variation and thus fraudulent
substitution or modification is prevented
The cumbrousness and weight are also less than with older constructions. The
manipulation is equally simple and easy and more exact, as in the ordinary ones
the hook of the counterweight becoming worn, its, thickness prevents the
graduations being read and there is uncertainty about the point of suspension
of the load.
Having now described the said invention and the manner of performing the
same, as communicated to me by my foreign correspondent, I wish it understood,
that what I claim and desire to protect under the herein before in part recited
Letters Patent is :
The steelyard, substantially as herein set forth and illustrated.
In witness whereof I the said Alfred Julius Boult have hereunto set my hand
and seal this twenty ninth day of September, in the year of Our Lord One
thousand eight hundred and eighty two.