. Electrical news and engineering. the transmission of energy in all itsforms, that it transmits these energies in definite waves andwith a known velocity, that it is perfect of its kind, but thatit still remains as inscrutable as gravity or light itself. Some Characteristics of Light We have seen, therefore, that anj disturbance of theether must originate with some disturbance of matter. Anexplosion, cyclone, or viliratory motion may occur in thephotosphere of the sun. A disturbance or wave is impressedon the ether. It is propagated in straight lines through falls on Mercury, Venus,
. Electrical news and engineering. the transmission of energy in all itsforms, that it transmits these energies in definite waves andwith a known velocity, that it is perfect of its kind, but thatit still remains as inscrutable as gravity or light itself. Some Characteristics of Light We have seen, therefore, that anj disturbance of theether must originate with some disturbance of matter. Anexplosion, cyclone, or viliratory motion may occur in thephotosphere of the sun. A disturbance or wave is impressedon the ether. It is propagated in straight lines through falls on Mercury, Venus, the Earth, and every other planetor ])article of ponderable matter met with in its course, andany mechanism, luiman or mechanical, capable of respond-ing to its undulations indicates its presence. Thus the eye supplies the sensation of light, the skin issensitive to heat, the galvanometer indicates electricity, themagnetrometer indicates disturbances in the earths magneticfield. \\e may look upon the magnificent generalization of. Refraction by Parallel Plate,—If a plane wave passes through a plateof glass witli parallel surfaces it is evident that at the second surface itwill be de\iated through tlie same angle into the original direction, thewave being simply displaced sideways by its passage through the \B, CD, EF, and CilT. in Fig. 2, represent successive positions of thewave - front passing through the plate, which is shaded. The amountof sideways displacement depends upon the obliquity of the wave to thesurface as well as on the thickness of the plate. The isevidently zero when the wave is parallel to the surface and is greatestwhen the obliquity is greatest, , when the wave-front is almost per-pendicular to the surface. Clerk Maxwell that all these disturbances are of the samekind, differing only in tlegree, as one of the greatest scientificachievements of our time. Light is an phe-nomenon, and electricity in its progress thro
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