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Updated: June 17, 2025
The pulsating direct currents are then passed through a filtering reactance coil, called a reactor, and one or more condensers, and these smooth them out until they approximate a continuous direct current.
The equipment of such a system at each end of the line consists of these two instruments, together with the special form of transmitter and the pole-changer and their keys for actuating the neutral and polar relays at the other, or distant, end. Besides these there are the compensating resistances and condensers.
Failing to find any gold, and being in need of flour, we made south to Kurnalpi, through country flat and uninteresting, and arrived at that camp just in time to secure the last two bags of flour. The town was almost deserted, and had none of the lively and busy appearance that it presented when I had last seen it. All who saw us praised our equipment and forethought in having portable condensers.
Get two honeycomb or other coils of the greatest wave length you want to receive, for in order to properly balance the aerial, or primary oscillation circuit, and the closed, or secondary oscillation circuit, you have to tune them to the same wave length; two .001 mfd. variable condensers, though fixed condensers will do, and two small single-throw double-pole knife switches mounted on porcelain bases.
In aid of stationary engines, "surface evaporator condensers" have been found very useful, particularly where the supply of water is very limited; and at waterworks it is now very common to pass the whole water pumped through a surface condenser, thus giving a good vacuum without the expenditure of any water, and with the result of only raising the temperature of the water a very few degrees, on account of its large volume.
They are fitted with gun metal tube-plates, and each contain 516 tubes, 3/4 inch in diameter, which have an exposed length of 6 feet 5 inches, and give a total cooling surface of 650 square feet. The air and circulating pumps are bolted to the back of the condensers, and are worked by levers from the engine crosshead.
It's an old method; induction coils, condensers, and even gravity itself are storing energy by straining space. But with Morey's apparatus we could store a lot more. "A torus-shaped induction coil encloses all its magnetic field within it; the torus, or 'doughnut' coil, has a perfectly enclosed magnetic field.
In the latter the impedance enters prominently into play as the frequency is increased, but the gas acts much as a series of condensers would: the facility with which the discharge passes through seems to depend on the rate of change of potential.
They have a capacitance of 1 mfd. and will stand 750 volts. These condensers cost about $2.00 each. The Filter Reactance Coil. It consists of a coil of wire wound on a soft iron core and has a large inductance, hence the capacitance of the filter condensers are proportionately smaller than where a small inductance is used which has been the general practice.
These condensers are made up of thin brass plates insulated with a special compound and pressed into a compact form. It is shown at e. Connecting Up the Apparatus. Your sending set should be mounted on a table, or a bench, where it need not be moved.
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