Improvements in or appertaining to Carbons for Electrical Purposes.
Year: 1896

page_text: Date of Application, 27th Mar., 1896
Complete Specification Left, 28th Dec., 1896-Accepted, 30th Jan., 1897
PROVISIONAL SPECIFICATION.
Improvements in or appertaining to Carbons for Electrical
Purposes.
A communication by ALBERT LESSING, of the Galvanic Carbon Works,
Nuremberg, in the Empire of Germany, Manufacturer.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6 Bank Street,
Manchester, both in the County of Lancaster, 118 New Street, Birmingham
in the County of Warwick, and 322 High Holborn in the County of Middlesex,
Civil Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to carbons for electrical purposes, particularly to the
attachment of binding screws or the like thereto, and consists in impressing screw
threads in fresh carbous by means of a sharp steel screw, the diameter of which
exceeds that of the screw which is to be subsequently inserted by an amount equal
to the shrinkage of the carbon by heating. By a subsequent heating of the
carbon, the thread therein becomes very sharp and adapted to fit the above
mentioned screw. If the said screw be then screwed therein, it has a complete
contact along its entire length with each thread of the internal screw and also
between its end and the bottom of the internal screw. The screw may be
somewhat pointed or tapered at the end in order to allow of its being readily
screwed in.
Dated this 26th day of March 1806
WM. P. THOMPSON & Co.,
Agents
Improvements in or appertaining to Carbons for Electrical
Purposes.
A communication by ALBERT LESSING, of the Galvanic Carbon Works,
Nuremberg, in the Empire of Germany, Manufacturer.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E. of The Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool, and 6 Bank Street,
Manchester, both in the County of Lancaster 118 New Street, Birmingham, in
the County of Warwick and 322 High Holborn in the County of Middlesex, Civil
Engineer, 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 relates to carbons for electrical purposes, particularly to the
attachment of binding screws or the like thereto, and consists in impressing screw

page_text: threads in fresh carbons by means of a sharp steel screw, the diameter of which
exceeds that of the screw which is to be subsequently inserted by an amount equal
to the shrinkage of the carbon by heating. By a subsequent heating of the
carbon, the thread therein becomes very sharp and adapted to fit the above
mentioned screw. If the said screw be then screwed therein, it has a complete
contact along its entire length with each thread of the internal screw and also
between its end and the bottom of the internal screw. The screw may be
somewhat pointed or tapered at the end in order to allow of its being readily
screwed in.
A carbon fitted with a binding screw according to the present invention is shown
in the accompanying drawings, in which Figure 1 is a front elevation and Figure 2
a side elevation.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
1. The improvement in carbons for electrical purposes to facilitate attachment
of binding screws or the like, which consists in impressing screw-threads therein
whilst still fresh by means of a sharp steel screw whose diameter exceeds that of the
binding screw by an amount equal to the shrinkage of the carbon by heating,
whereby on the subsequent heating of the carbon the thread formed therein
becomes very sharp and adapted to receive the binding screw or the like with a
-close fit.
Dated this 23rd day of December 1896.
WM. P. THOMPSON & Co.,
Agents.