The Theory and Practice of Absolute Measurements in Electricity and Magnetism, Volume 1Macmillan and Company, 1888 - Electric measurements |
Contents
| 1 | |
| 7 | |
| 13 | |
| 17 | |
| 23 | |
| 29 | |
| 35 | |
| 41 | |
| 46 | |
| 53 | |
| 59 | |
| 66 | |
| 72 | |
| 76 | |
| 82 | |
| 89 | |
| 101 | |
| 109 | |
| 124 | |
| 131 | |
| 138 | |
| 144 | |
| 150 | |
| 156 | |
| 162 | |
| 171 | |
| 177 | |
| 180 | |
| 190 | |
| 201 | |
| 206 | |
| 220 | |
| 230 | |
| 238 | |
| 323 | |
| 329 | |
| 338 | |
| 353 | |
| 374 | |
| 380 | |
| 389 | |
| 395 | |
| 407 | |
| 416 | |
| 418 | |
| 425 | |
| 451 | |
| 466 | |
| 478 | |
| 484 | |
| 490 | |
| 498 | |
| 505 | |
| 506 | |
| 507 | |
| 508 | |
| 510 | |
| 511 | |
| 515 | |
Other editions - View all
Common terms and phrases
arrangement attraction axis ball battery bution cable centimetres centre circuit coils comparison condenser conducting conductor connected constant copper corresponding cross-section cylinder deflection denote diameter dielectric difference of potentials direction disc distance Distri ductor dx dy dz electric distribution electric field electric force electrification electrometer electromotive force electrostatic element ellipsoid energy equal equation equipotential surface flow galvanometer given Green's Theorem guard-ring heat Hence homœoid infinitely insulated internal inverse K₁ K₂ Laplace's equation lines of force magnetic mass measured medium ment meter method mirror moment of inertia needle normal numeric obtained plane plate position produced quadrants quantity of electricity r₁ r₂ radius ratio resistance right angles scale shell space specific inductive capacity sphere spherical surface suppose surface density surface integral taken temperature theorem theory tion torsional tricity tube V₁ V₂ velocity wire zero potential
Popular passages
Page 186 - Britain as the unit of mass for the expression of dynamical results, but in engineering and the arts, larger units, for example, the ton, or mass of 2240 Ibs., and the hundred-weight, or mass of 112 Ibs., are frequently employed. The French standard of mass is a piece of platinum called the Kilogramme des Archives, made also by Borda in accordance with the decree of the Republic mentioned above. It was connected with the standard of length by being made a mass as nearly as possible equal to that...
Page 499 - The unit of electric quantity shall be the coulomb, which is the quantity of electricity transferred by a current of one ampere in one second.
Page 2 - The force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Page 183 - The straight line or distance between the centres of the transverse lines in the two gold plugs in the bronze bar deposited in the Office of the Exchequer shall be the genuine standard of length at 62° F., and if lost it shall be replaced by means of its copies.
Page 153 - Kirchhojfs second law. In any closed circuit of conductors forming part of any linear system, the sum of the products obtained by multiplying the current in each part taken in order round the circuit by its resistance is equal to the sum of the electromotive forces in the circuit.
Page 410 - Mance-s method) by which one of them (viz. electromotive force) is eliminated electrically ; but two strengths of current are just as essential in the latter case as in the former, as also it is just as necessary that the two unknown quantities shall remain constant. It is possible that the resistance, as well as the electromotive force, of a battery does not accurately fulfil this condition, but that it varies to some extent with the current ; in so far as it does this, however, it is not a definite...
Page 198 - The work done by a force is equal to the product of the force and the distance through which the point of application is moved in the direction of the force...
Page 188 - ... the hour-angle of the vernal equinox counted in the direction of the apparent motion of the stars. Sidereal time is zero hours, minutes, and seconds at the instant when the vernal equinox transits across the meridian. It includes 24 hours, numbered consecutively from zero. An apparent solar day is the interval between two successive transits of the sun across the meridian. The apparent solar time for any station of observer and any instant is the hour-angle of the real sun at that instant for...
Page 197 - ... and magnetic quantities, namely, the centimetre as unit of length, the gramme as unit of mass, and the second as unit of time. With these units, therefore, the unit force is that force which, acting for one second on a gramme of matter, generates a velocity of one centimetre per second. This unit of force has been called a dyne. The unit magnetic pole, therefore, in the cgs system of units is that pole which, placed at a distance of i centimetre from an equal and similar pole, is repelled with...
Page 195 - ... it involves constant use of a powerful mathematical tool known as 'calculus'. Its scope can be illustrated by an example. It is easy to work out the velocity at any time of a falling body. For the acceleration, or rate of increase of velocity, of a falling body on the earth is a constant quantity, 981 centimetres per second per second (or 32 feet per second per second), denoted by g.