which it is to be actuated
Any electric signal has upper and lower limits of current between
which it is to be actuated. It must receive current enough to operate
but not enough to become damaged by overheating. The magnetic types of
visible signals have a wider range between these limits than have lamp
signals. If current in a lamp […]

in a circuit in such a way as to _transform_ direct currents into
alternating ones, or it may be used merely to change constant direct
currents into _undulating_ ones, which _never_ reverse direction, as
alternating currents _always_ do
The carbon transmitter, however, may be associated with other devices
in a circuit in such a way as to _transform_ direct currents […]

proof of the pudding is that all of the powerful club
we have approached have refused to assist in the very
new concept of truly Universal Education
Power certainly accrues to those who covet it and the
proof of the pudding is that all of the powerful club
we have approached have refused to assist in the very
new concept of […]

minium (Pb204) and dilute sulphuric acid (H2SO4), by which a large
quantity of peroxide and spongy lead could be formed on the
plates
Faure improved the Plante cell by adding a paste of red lead or
minium (Pb204) and dilute sulphuric acid (H2SO4), by which a large
quantity of peroxide and spongy lead could be formed on the
plates. Sellon and […]

circuit from the central office, only the bell at Station A will
operate, since the bells at the other stations are not in the circuit
Obviously, if a proper ringing current is sent over the metallic
circuit from the central office, only the bell at Station A will
operate, since the bells at the other stations are not in […]

York City that was the record-breaker when the
era of telephone expansion arrived
But as might have been expected, it was New
York City that was the record-breaker when the
era of telephone expansion arrived. Here the
flood of big business struck with the force of a
tidal wave. The number of users leaped from
56,000 in 1900 up to 810,000 in […]

direct-current receiver is that it did not come into use until after
about twenty years of common-battery practice
An astonishing feature of this recent development of the so-called
direct-current receiver is that it did not come into use until after
about twenty years of common-battery practice. There is nothing new in
the principles involved, as all of them were already […]

metallurgical industry and at that time it was carried on on a
very limited scale
Prior to 1886 the refining of copper was the only electro-
metallurgical industry and at that time it was carried on on a
very limited scale. To-day the production of electrolytic copper
as an industry is second in importance only to the actual
production of that […]

one of Fig
Two conventional signs are used to illustrate condensers, the upper
one of Fig. 29 growing out of the original condenser of two metal
plates, the lower one suggesting the thought of interleaved conductors
of tin foil, as for many years was the practice in condenser
construction.

built camera in mobile phone
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employed for bridging party lines, it is customary to make the cores
rather long and of somewhat larger diameter than in series ringers and
at the same time to wind the coils with rather fine wire so as to
secure the requisite number of turns
In order that the requisite impedance may be given to the ringers
employed for bridging […]