Medical Electricity Röntgen Rays and Radium: With a Practical Chapter on Phototherapy

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W.B. Saunders Company, 1915 - 1219 pagine

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Pagina 215 - The gram calorie, or small calorie (cal.), is the amount of heat required to raise the temperature of 1 gram of water 1°...
Pagina 204 - Must be so placed in wet places that an air space will be left between conductors and pipes in crossing, and the former must be run in such a way that they cannot come in contact with the pipe accidentally. Wires should be run over, rather than under, pipes upon which moisture is likely to gather or which, by leaking, might cause trouble on a circuit.
Pagina 220 - The lower limit Is specified for rubber-covered wires to prevent gradual deterioration of the high insulations by the heat of the wires, but not from fear of igniting the insulation. The question of drop is not taken into consideration in the above tables.
Pagina 192 - Such an electromotive force as would cause a current of one ampere to flow through a resistance of one ohm.
Pagina 204 - Must not be placed in the immediate vicinity of easily ignitible stuff or where exposed to inflammable gases or dust or to flyings of combustible material.
Pagina 204 - Must be so spliced or joined as to be both mechanically and, electrically secure without solder. The joints must then be soldered to insure preservation and covered with an insulation equal to that on the conductors.
Pagina 193 - The current in amperes is equal to the electromotive force in volts divided by the resistance in ohms.
Pagina 220 - That is, the resistance is inversely proportional to the fourth power of the diameter of the wire. If the ampere-turns are kept constant, then £-="- (-M C -»" ' in which C and C' are the currents necessary with « and «
Pagina 248 - The amounts of different substances liberated by the same quantity of electricity are proportional to their chemic equivalent weights.
Pagina 265 - The tube is open at one end and closed at the other by a movable piston. A tuning fork near the open end is vibrating with a frequency of 500 cycles/sec.

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