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action atoms aurora axis bismuth body centimetres charge chemical chemical elements circle circuit color compass curve deflection density direction disc discharge distance Earth effect elec electric current electromagnetic waves elements energy equal equation ether experiments galvanometer glass heat hence horizontal illustrated induced instrument iron length Leyden jar light lines of force luminous magnetic condition magnetic field magnetic force magnetic meridian mass matter maxima and minima means medium metal mirror molecules motion move movement needle netic Nicol prisms observed oscillation parallel particles pass phenomena photosphere plate polarized pole position prism produce quantity radiation rays refraction represent result right angles rotation side solenoid space spark spectrum steel magnet substance surface swing telluric currents temperature terrestrial terrestrial magnetism tion torsion tricity tube turn twist vapor Variation varied velocity vertical plane vibration vortex rings wave-motion wire
Page 5 - a single spark from the prime conductor of a machine, of about an inch long, thrown on to the end of a circuit of wire in an upper room, produced an induction sufficiently powerful to magnetize needles in a parallel circuit of iron placed in the cellar beneath, at a perpendicular distance of 30 feet, with
Page 515 - and partly kinetic. The potential energy is supposed to be due to the distortion of the elementary portions of the medium: we must therefore regard the medium as elastic. ' The kinetic energy is supposed to be due to the vibratory motion of the medium: we must therefore regard the medium as having a finite density.
Page 371 - Now, chief of all, the magnet's power I sing, And from what laws the attractive functions spring ; The magnet's name the observing Grecians drew From the magnetic region where it grew ; Its viewless potent virtues, men surprise, Its strange effects they view with wondering eyes,
Page 362 - 1859, and was independently witnessed by two well-known and reliable observers, Mr. Carrington and Mr. Hodgson. Mr. Carrington at the time was making his usual daily observation upon the position, configuration, and size of the spots by means of an image of the solar disk upon a screen,
Page 362 - Mr. Carrington at the time was making his usual daily observation upon the position, configuration, and size of the spots by means of an image of the solar disk upon a screen, being then engaged upon that eight years' series of observations which lies at the foundation of so much of our present solar science. Mr. Hodgson, at
Page 109 - In the case of magnesium, iron, and calcium the changes observed on passing from the temperature of the arc to that of the spark have been minutely observed. In each, new lines are added or old ones are intensified at the higher temperature. Such lines have been termed enhanced lines.
Page 498 - theory an enormous province of transcendent interest and importance; it demands of us not merely an explanation of all the phenomena of light and radiant heat by transverse vibrations of an elastic solid called ether, but also the inclusion of electric currents, of the permanent magnetism of steel and lodestone, of magnetic force, and of electrostatic force, in a comprehensive ethereal dynamics.
Page 363 - There are a number of observed instances, which, though not sufficient to demonstrate the fact, still render it very probable that every intense disturbance of the solar surface is propagated to our terrestrial magnetism with the speed of light. An instance fell under the writer's
Page 15 - the violet, the bright lines flash out by hundreds and thousands almost startlingly; as suddenly as stars from a bursting rocket head, and as evanescent, for the whole thing is over within two or three seconds. The
Page 227 - being stroken into some cholar, I applied myself to seeke further into this effect, and making certaine learned and expert men, my friends, acquainted in this matter, they advised me to frame some instrument to make some exact triall how much the needle touched with the stone would decline, or what greater angle it would make with the plaine of the horizon.