A text-book on chemistryFor the use of schools and colleges . What is the delicacy of spectral reactions?tography in spectral analysis? Of what use is pho- SPECTRA OF VARIOUS BODIES. 99 The spectra of many substances can only be seen byhaving recourse to the aid of RuhmkorfPs coil, the term-inal wires being coated with the body to be tried, orelse the spark passed through a vessel or tube contain-ing it. In Fig. 73, No. 1 shows the principal dark lines of thesolar spectrum; 2 represents the spectral lines or bandsproduced by the absorbing action of bromine; 3, those C J? a A. What does Fig. 78
A text-book on chemistryFor the use of schools and colleges . What is the delicacy of spectral reactions?tography in spectral analysis? Of what use is pho- SPECTRA OF VARIOUS BODIES. 99 The spectra of many substances can only be seen byhaving recourse to the aid of RuhmkorfPs coil, the term-inal wires being coated with the body to be tried, orelse the spark passed through a vessel or tube contain-ing it. In Fig. 73, No. 1 shows the principal dark lines of thesolar spectrum; 2 represents the spectral lines or bandsproduced by the absorbing action of bromine; 3, those C J? a A. What does Fig. 78 represent ? 100 THE ETHEK. of nitrous acid; 4, those of perchloride of manganese;5 is the spectrum obtained by burning chloride of cop-per in alcohol; and 6, boracic acid in alcohol. In Fig. 74 the solar spectrum, with its principal lines,is placed above, and below, in order, are the spectra ofpotassium, sodium, lithium, rubidium, caesium, stron-tium, calcium, barium, and thallium. LECTURE XIX. Wave Theory of Light.—Proofs of the Existence ofthe Ether.—Light consists of Waves in it.— TheEthereal Particles move but little.—distinction be-tween Vibration and Undulation.—FresneVs Theoryof Transverse Vibrations.—Transverse and NormalWaves.—Brilliancy of Light depends on AmjMtudeof Vibration. The cause of light is an undulatory movement takingplace in the ethereal medium. That such a medium ex-ists throughout all space, seenis to be proved by a num-ber of astronomical facts. It exerts a resisting agencyon bodies moving in it. From its tenuity, we shouldscarc
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