## Transactions of the International Electrical Congress, St. Louis, 1904 ... |

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### Contents

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### Common terms and phrases

absolute activity alternating current ampere ampere-turns anode apparatus armature C. G. S. system C. G. S. units cable calculated cathode cent centimetre charge circuit Clark cell coefficient coherer coil condenser conductivity Congress constant curve definition determined dielectric earth effect elec electrical units electromagnetic electromotive force electrons electrostatic emanation equation equivalent error experiments flux formula frequency fundamental galvanometer gases Geissler tube given harmonic heat hydrogen hysteresis increase inductance insulation International Electrical Congress ionization J. J. Thomson joules length machine magnetic field maximum mean measurements mercurous sulphate mercury metal meter method millimetre motor negative ions observed obtained OOO'I OOO'I paper particles Phys plates positive ions practical pressure produced Prof quantity radioactive radium ratio rays reaction resistance silver voltameter sinh sinusoidal speed standard cell surface temperature theory tion tube variation velocity voltage volts wave Weston cell wire

### Popular passages

Page 159 - As a unit of resistance, the international Ohm. which is based upon the ohm equal to 109 units of resistance of the CGS system of electro-magnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grammes in mass, of a constant cross-sectional area, and of a length of 106.3 centimetres.

Page 155 - As a unit of current, the international ampere, which is onetenth of the unit of current of the cgs system of electromagnetic units, and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, and in accordance with accompanying specifications, deposits silver at the rate of 0.001118 of a gramme per second.

Page 171 - Now, therefore, her Majesty, by virtue of the power vested in her by the said Act, by and with the advice of her Privy Council, is pleased to approve the several denominations of standards set forth in the schedule hereto as new denominations of standards for electrical measurement.

Page 155 - As a unit of work, the joule, which is equal to 107 units of work in the CGS system, and which is represented sufficiently well for practical use by the energy expended in one second by an international ampere in an international ohm. As a unit of power, the watt, which is equal to 10...

Page 155 - As a unit of quantity, the international coulomb, which is the quantity of electricity transferred by a current of one international ampere in one second. As a unit of capacity, the international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity.

Page 155 - ... As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere...

Page 155 - As a Unit of Resistance, the International Ohm, which is based upon the ohm equal to io9 units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grammes in mass of a constant cross-sectional area, and of the length of 106.3 centimetres.

Page 155 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by ^2.

Page 156 - As a unit of power, the watt, which is equal to 10* units of power in the cgs system, and which is represented sufficiently well for practical use by the work done at the rate of one joule per second. " As the unit of induction, the henry, which is the induction in a circuit when the electromotive force induced in this circuit is one international volt, while the inducing current varies at the rate of one ampere per second.

Page 156 - The anode should be a plate of pure silver some 30 sq. cms in area and 2 or 3 rams in thickness. This is supported horizontally in the liquid near the top of the solution by a platinum wire passed through holes in the plate at opposite corners.