ly and uniformly between the drum, M',
and the stylus, m, of this instrument in a well known manner. The drum,
M', is connected with the earth by conductors, 4 and 3, between which is
placed the auxiliary battery, E, the positive or marking pole of this
battery being connected with the drum and the negative pole with the
earth. The electro-motive force of the battery, E', is preferably made
about one-third as great as that of the battery, E.

[Illustration]

Extending from a point, o, in the main line, near the transmitting
station, to the earth at G, is a branch conductor, l, containing an
adjustable artificial resistance, R. A similar conductor, ll, extends
from a point, o', near the receiving terminal of the line, L, to the
conductor, 3, in which an artificial resistance, R', is also included,
this resistance being preferably approximately equal to the resistance,
R. The proportions of the resistance of the main line and the artificial
resistances which I prefer to employ may be approximately indicated as
follows: Assuming the resistance of the main line to be 900 ohms, the
resistance, R, and R', should be each about 3,000 ohms. The main
battery, E, should then comprise about 90 cells, and the auxiliary
battery, E', 30 cells.

The operation of my improved system is as follows: While the apparatus
is at rest a constant current from the battery, E', traverses the line,
L, and the branch conductors, l, and ll, dividing itself between them,
in inverse proportion to their respective resistances, in accordance
with the well-known law of Ohm. When the transmitting pattern strip, P,
is caused to pass between the roller, T, and the stylus, t, electric
impulses will be transmitted upon the line, L, from the positive pole of
the battery, E, which will traverse the main line, L, the two branch
lines, l, and ll, and their included resistances, and also the receiving
instrument, M. The greater portion of this current will, however, on
account of the less resistance offered, traverse the receiving
instrument, M, and the auxilary battery, E'. The current from the
last-named battery will thus be neutralized and overpowered, and the
excess of current from the main battery, E, will act upon the chemically
prepared paper and record in the form of dots and dashes or like
arbitrary characters the impulses which are transmitted.

Immediately on the cessation of each impulse, the auxiliary battery, E',
again acts to send an impulse of p