IMPROVEMENTS IN SIGNALLING BY ELECTRICITY IN OPPOSITE DIRECTIONS THROUGH THE SAME WIRE SIMULTANEOUSLY.
Year: 1876

page_text: LETTERS PATENT to Benjamin Smith, of Malta, and of 366, Camden Road,
in the County of Middlesex, Electrician, for the Invention of "IMPROVEMENTS
IN SIGNALLING BY ELECTRICITY IN OPPOSITE DIRECTIONS THROUGH THE SAME
WIRE SIMULTANEOUSLY.'
"
Sealed the 4th July 1876, and dated the 5th January 1876.
PROVISIONAL SPECIFICATION left by the said Benjamin Smith at the Office
of the Commissioners of Patents, on the 5th January 1876.
BENJAMIN SMITH, of Malta, and of 366, Camden Road, in the County of Mid-
dlesex, Electrician. "IMPROVEMENTS IN SIGNALLING BY ELECTRICITY IN OPPOSITE
DIRECTIONS THROUGH THE SAME WIRE SIMULTANEOUSLY."
This Invention relates,-
Firstly. To means of transmitting signals through a wire in opposite directions
simultaneously, by which the "kick" or the result of "charge" and "discharge" is
so far prevented as not to be an obstacle to the transmission of signals in opposite
directions simultaneously through the same wire.
Secondly. To means by which greater definition in the signals is obtained when
transmitting them in opposite directions simultaneously, as aforesaid, whilst a less
amount of battery power is requisite.
The first improvement is effected by the invention of an adjustable resistance at
or near the termini of the cable between the one point of union of the Wheatstone
bridge, or other differential arrangement, and the artificial line, or between the
other point of union of the differential arrangement and the cable, between either
or both points.
The second improvement is effected by placing the condenser or condensers in
such a position as to avoid using resistances to obtain the Wheatstone balance,
namely, between the key and the instrument on the one side, and between the key
and the instrument on the other side.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Benjamin Smith in the Great Seal Patent Office on the 5th July 1876.
BENJAMIN SMITH, of Malta, and of 366, Camden Road, in the County of Middle-
sex, Electrician. "IMPROVEMENTS IN SIGNALLING BY ELECTRICITY IN OPPOSITE
DIRECTIONS THROUGH THE SAME WIRE SIMULTANEOUSLY."
This Invention relates to improvements in signalling by electricity in opposite
directions through the same wire simultaneously.
The first improvement is effected by the insertion of an adjustable resistance A at
or near the termini B, B¹, of the cable between the one point of union C of the
Wheatstone bridge D, or other differential arrangement, and the artificial line F, or
between the other point of union C¹ of the differential arrangement and the cable G,
between either or both points.
I claim as my first improvement the insertion of an adjustable resistance in the
position described, and as shown in the accompanying Drawings for signalling
in opposite directions through the same wire simultaneously.
The second improvement is effected by placing the condenser or condensers H in
such a position as to avoid using resistances to obtain the Wheatstone balance,
namely, between the key K and the instrument on the one side, and between the
key and the instrument on the other side.
I claim as my second improvement, the insertion of the condenser in the position
described, and as shown in the accompanying Drawings, for the purpose set forth.
In witness whereof, I, the said Benjamin Smith, have hereunto set my band
and seal, this Fifth day of June One thousand eight hundred and seventy-six.
Tזוחת
CUTITY
'