## A System of Electrotherapeutics: Direct currents. Magnetism and electromagnetism. Electrosiatics and high-frequency currents. Accessory apparatus |

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action alternating current ammeter ampere-hours amperes apparatus armature arrangement arrows bath battery binding-posts body brushes carbon carriers centimeter coating combination conductor connected copper core coulomb current-strength cylinder decrease density depolarizer difference of potential direct current discharge ductor dynamo effect electric current electrode electrolyte electromagnetic electromotive force electrostatic electrotherapeutics energy external circuit faradic inch increase indicated induced induction-coil instance insulated internal resistance iron latter Leyden jar lines of force magnetic field magnetic flux maximum means of Fig metal milliamperes molecules motion moving needle negative charge neutral north pole number of cells ohms opposite oxid parallel pass pipe plate polarity positive charge pressure primary coil produced quantity repel rheostat secondary coil self-induction send a current shown in Fig shunt solenoid spark strength substance supposed surface take place terminals tion total E. M. F. tube unit voltage voltaic cell voltmeter volts watts wire zinc

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Page 58 - The plates are usually approximately square, and from \ inch to •£ inch thick, according to size. To get a large surface area without using single large plates, and to allow of one size of plate being used for cells of various capacities, each cell contains a number of positive and negative plates, arranged alternately side by side a short distance apart. The number of negative plates is always one more than the number of positive plates, so that each side of each positive plate has presented...

Page 72 - ... theorem. In Fig. 34 water is taken from a tank or reservoir in which the water is maintained at a constant level by an inflowing stream, through a pipe of variable diameter fitted with tubes at various points. Since the pipe is short it may be supposed to be frictionless. If the end of the pipe is closed the water will rise in all the tubes to the same level as the water in the reservoir, but if the end C is opened, water will flow through the pipe and the water surfaces in the tubes will be...

Page 73 - City the acceleration of gravity is^= 980.26; at the equator, g = 978.1. 14. The unit of force is the dyne, and is that force which, acting on a mass of 1 gram for 1 second, gives to it a velocity of 1 centimeter per second. 15. The unit of work is the erg, and is that amount of work performed when a force of 1 dyne is overcome through a distance of 1 centimeter; that is, the work done in pushing a body through a distance of 1 centimeter against a force of 1 dyne; the unit of work, the erg, therefore...

Page 72 - The unit of volume is the cubic centimeter, and is the volume contained in a cube each of whose edges is 1 centimeter in length. 1 cubic centimeter equals .06102 cubic inch; 1 cubic inch equals 16.387 cubic centimeters.

Page 115 - Fig. 47 (6) is divided into a number of equal parts corresponding to the number of divisions of the circle in Fig.

Page 15 - ... two main parts: a thin cake of resinous material cast in a round metal dish, or pan, B, about 1 foot in diameter, and a round disk A, of slightly smaller diameter, made of metal and provided with a glass handle. In modern instruments, B is usually made of ebonite. 47. When using the electrophorus, the resinous cake must first be beaten or rubbed with a warm piece of woolen cloth or fur. The disk, or cover, is then placed on the cake, the metal part is touched momentarily with the finger to liberate...

Page 4 - B, the case would be similar in that A has the legal title and B has the beneficial interest. The chief difference between the two cases is that in the case of the assignment A is not a fiduciary; he has no positive duties to perform but is under the negative duty not to interfere with B's beneficial in1. If the chose In action is negotiable, the obligor assents In advance to the transfer and hence title passes.

Page 72 - The unit of area is the square centimeter, and is the area contained in a square each of whose sides is 1 centimeter in length. 1 square centimeter equals .155 square inch; 1 square inch equals 6.452 square centimeters.

Page 77 - One kUowatt-hour is the quantity of energy supplied in 1 hour by a current of such voltage that the product of volts, amperes, and hours comes to 1,000; for instance, a current of 5 amperes at 20 volts for 10 hours, or a current of 100 amperes at 10 volts for 1 hour. 118. Even these units are sometimes either too large or too small, and prefixes of mega, micro, and milli are then used. They facilitate the calculations and measurements of exceedingly large or small quantities. Mega means "one million";...