Light and Electricity: Notes of His Courses of Lectures Before the Royal Institution of Great BritainD. Appleton & Company, 1878 - 194 pages |
Other editions - View all
Common terms and phrases
angle of incidence aperture atoms attraction augmented axis bands battery body bright bright bands cable called caused centre circuit Cloth coil colors conductor core crystal dark diamagnetic direction discharge distance double refraction duced earth effect elasticity electric current electrified electro-magnet electrode emission theory employed ether ether waves Faraday film flame force formed galvanometer glass gypsum heat helix Hence hydrogen Iceland spar illuminated Illustrations index of refraction intensity iron lens lines liquid luminous magnetic marginal rays metals mirror motion needle object oblique obtained optic oxygen parallel particles passes perpendicular phenomena placed plane of vibration plate platinum polarized poles portion position primary principal focus prism produce Prof rays reflected refractive index repelled retardation retina rings rotation round screen secondary shadow slit solar spark spectrum spherical square substance surface thickness tion tourmaline transmitted vapor voltaic current waves white light wire zinc
Popular passages
Page 159 - ... of an inch), a bright spark was produced, and more than half the volume of the charcoal became ignited to whiteness; and by withdrawing the points from each other, a constant discharge took place through the heated air, in a space equal at least to four inches, producing a most brilliant ascending arch of light, broad, and conical in form, in the middle.