# Practical Wireless Telegraphy: A Complete Text Book for Students of Radio Communication (Google eBook)

Wireless Press, Incorporated, 1921 - Radio - 336 pages

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Page 69 - H2SO4, until no more sulphate remains and all the acid has been returned to the electrolyte. It will then be of the same strength as before the discharge and the same acid will be ready to be used over again during the next discharge. Since there is no loss of acid, none should be added to the electrolyte.
Page 29 - This experiment shows that a wire carrying a current in a magnetic field tends to move in a direction at right angles both to the direction of the field and to the direction of the current.
Page 16 - Rule. — If the current is flowing in the conductor away from the observer, then the direction of the lines of force will be around the conductor in the direction of the hands of a watch.
Page 36 - If a mile of a certain copper wire having a diameter of -fa inch has a resistance of 14.06 ohms at 75° F., what will be the resistance between opposite faces of a cube measuring 1 inch on each side, that is, the resistance per inch cube ? Ans. .6808 microhm ELECTROSTATIC CAPACITY 43. The electrostatic capacity of a conductor is measured by the quantity of electricity with which it must be charged in order to raise its electric potential from zero to unity. To make the meaning clearer, let us consider...
Page 88 - H) are at right angles to each other and to the direction of propagation. The field stength is given by the RMS value of E in volts/m.
Page 23 - EMF will be induced in the loop, the magnitude of which depends on the rate of change of the number of lines of force threading through the loop.
Page 69 - ... action which took place in the cells during discharge. It will be remembered that during discharge the acid of the solution went in and combined with the active material, filling its pores with sulphate and causing the solution to become weaker. Reversing the current through the sulphate in the plate restores the active material to its original condition and returns the acid to the solution.
Page 79 - Current passing in either direction (charge or discharge) decomposes the potassium hydrate of the electrolyte, and the oxidation and reductions at the electrodes are brought about by the action of its elements. An amount of potassium hydrate equal to that decomposed is always re-formed at one of the electrodes by a secondary chemical reaction, and consequently there is none of it lost and its density remains constant.
Page 79 - ... solution, the first charging of a cell reduces the iron oxide to metallic iron while converting the nickel hydrate to a very high oxide, black in color. On discharge, the metallic iron goes back to iron oxide and the high nickel oxide goes to a lower oxide but not to its original form of green hydrate. On every cycle thereafter, the negative charges to metallic iron and discharges to iron oxide, while the positive charges to a high nickel oxide.
Page 9 - ... write For example, a circuit having a resistance of 10 ohms will have a conductance of 0.1 and one of 0.01 ohm will have a conductance of 100. The unit of resistance called the ' ' ohm " is defined in terms of a standard consisting of pure mercury, of accurately specified length, mass and temperature. The international ohm is the resistance offered to the flow of an unvarying current by a column of mercury 106.3 centimeters high and weighing 14.4r>%! grains at a temperature of0° C. For very...