The ratchet wheel is stepped around automatically by each impulse of current from an ordinary pole changer such as is employed in ringing biased bells.
Furthermore, the placing of the battery in series in the circuit of the two combined lines does not lend itself readily to the supply of current from a common source to more than a single pair of lines.
Such a signal is operated by the making and breaking of current from a battery.
Early experimenters upon Bell's device, all using in their first work the arrangement utilizing current from a battery in series with the line, noticed that sound was given out by disturbing loose contacts in the line circuit.
The passage of current from a local battery sets up electrolysis, and so stops itself by forming a film of oxygen on the small electrode.
Current from a dynamo flows through the arc, whereupon currents oscillate through the condenser and coil (as described in the text).
So current from a battery flows to the two wires leading to the distant station, each passing through the rheostat connected to one of the cranks.
From such work came an early familiarity with the nature of electrical batteries and the production of current from them.
Field, for the combination of an electric motor operated by means of a current from a stationary dynamo or source of electricity conducted through the rails.
In short, a current from an electrical machine or a Leyden jar will do everything that a current from an electric battery will do.
For long-distance telegraphy a current from a dynamo is used instead of a battery current.
The primary coil with a current from a battery flowing through it acts in all respects like a magnet; but as soon as the current ceases to flow the magnetic field disappears--the coil is no longer a magnet.
To this apparatus there may be added a second bobbin of coarser wire into which is passed a current from a local pile.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "current from" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
