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INDEX.
- Aberration, 149.
- Accuracy of measurement: value of increasing, 23; limit without lenses, 25; limit with lenses, 27; increase due to lenses, 30; increase due to interferometer, 36; of standards of length with grating, 85; of length of seconds pendulum, 86; of earth's circumference, 87; of wave length with the interferometer, 98.
- Air wedge: interference produced by, 15.
- Amphipleura pellucida: use as test of resolution, 30.
- Amplitude, 6.
- Analysis: of periodic curves, 68; of the nature of a source of light, 76.
- Analyzer: harmonic, 68.
- Arago: velocity of light, 48; interferometer, 51.
- Beats: between tuning-forks, 12.
- Black spot: on soap film, 53; thickness of, 54.
- Boiling of star images, 129.
- Bradley: aberration, 149.
- Burnham: Jupiter's satellites, 142.
- Cadmium: analysis of radiations of, 81; red radiation as standard of length, 91; number of waves in meter, 98; action of magnetism on radiations of, 116.
- Comets: resistance by ether to motion of, 45.
- Corpuscular theory, 44.
- Diffraction: of sound waves, 19; in telescope and microscope, 29; by rectangular opening, 32.
- Diffraction pattern: due to circular opening, 29, 130; due to rectangular opening, 133; due to two slits, 134.
- Double slit: use of in astronomical work, 134.
- Earth: resistance by ether to motion of, 45, 148; circumference of as standard of length, 87.
- Echelon spectroscope, 122.
- Efficiency: of microscope and telescope, 25.
- Electrolysis, 113.
- Electromagnetic nature of light, 160.
- Engelmann: Jupiter's satellites, 142.
- Ether: properties of, 45, 146; vortex-theory of, 161.
- Expansion: measurement of coefficient of, 55.
- Faraday: action of magnetism on light, 107.
- Fievez: action of magnetism on light, 107.
- Fitzgerald: action of magnetism on light, 112.
- Fizeau: velocity of light, 48; in moving media, 152.
- Foucault: velocity of light, 48.
- Fraunhofer: lines in solar spectrum, 60.
- Fresnel: measurement of index of refraction, 51; moving media, 152.
- Fringes: due to two openings, 33; breadth of, 34; use of in spectrum analysis, 64.
- Gases: liquefaction of, 24.
- Gould: standards of length, 84, 103.
- Grating: diffraction, 23, 84, 119; efficiency of, 121.
- Gravitation constant: measurement with interferometer, 56.
- Gun sight: use in measuring angles, 25.
- Harmonic motion, 6; analyzer, 68.
- Hertz: oscillator, 160.
- Hough: Jupiter's satellites, 142.
- Hydrogen: analysis of radiations of, 78.
- Image: formation of, 26.
- Interference: definition of, 8; of sound waves, 9; of mercury ripples, 11; of light in soap film, 12; of two trains of waves, 64.
- Interferometer: definition of, 33, 36; description of, 40; application of to measure index of refraction, 51; to measure thickness of soap film, 53; to measure coefficient of expansion, 55; to measure gravitation constant, 56; to test screws, 57; to measure light waves, 58; to analyze spectral lines, 60, 73, 78; to determine standards of length, 89; to the Zeeman effect, 108, 114; to astronomical measurements, 127; to aberration, 157.
- Intermediate standards of length, 93.
- Iron: spectrum of, 62.
- Johonnott: thickness of liquid films, 54.
- Jupiter, 128; size of satellites, 141.
- Kelvin: dynamic model of wave motion, 5, 16.
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