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.
- Larmor: action of magnetism on light, 112.
- Lens: formation of image by, 26.
- Leverrier: discovery of Uranus, 24.
- Linear measurements: attainable accuracy in, 25.
- Lorentz: action of magnetism on light, 112; aberration, 156.
- Magnetism: action on light, 107.
- Magnification: produced by lens, 27; loss of light in, 27; of fringes by interferometer, 32.
- Manometric capsule, 10.
- Mars, 128.
- Maxwell: aberration, 156.
- Mercury: analysis of radiations of, 80.
- Meter: manufacture of, 87; value in waves of cadmium light, 101.
- Microscope: efficiency of, 25; limit of resolution of, 30.
- Molecules: complexity of, shown by spectrum, 82.
- Morley: measurement of coefficient of expansion, 55.
- Moving media: effect on velocity of light, 151.
- Music: color, 2.
- Newton: corpuscular theory, 45; spectrum, 60.
- Objective: relation to size of diffraction pattern, 30.
- Pendulum: motion of, 6; as standard of length, 86.
- Period, 6.
- Phase: defined, 7; loss of by reflection, 16.
- Poisson: diffraction, 21.
- Polarization, 110.
- Quincke: interference of sound, 9.
- Rayleigh: diffraction of sound, 21; discovery of Argon, 24.
- Reflection: change of phase on, 16.
- Refraction: comparison of theories of, 47; index of, 50; measurement of index of, 51.
- Resolution: of telescope, 29, 130; of microscope, 30; of spectroscope, 62; of grating, 121; of echelon, 125.
- Revolving mirror, 48.
- Ripples: interference of on surface of mercury, 11.
- Rogers: measurement of coefficient of expansion, 55.
- Ruskin, 1.
- Saturn, 128.
- Screw: testing with interferometer, 57.
- Sensitive flame, 19.
- Simple harmonic motion, 6; curve, 7.
- Sine curve, 7.
- Slit: diffraction produced by, 22.
- Soap film: colors of, 14.
- Sodium: spectrum of, 61: distance between lines a standard of measurement, 62; distance between lines of, 66; analysis of radiations of, 78; action of magnetism on radiations of, 107.
- Sound waves: interference of, 9; diffraction of, 19; shadow produced by, 20.
- Source of light: distribution of, 75.
- Spectral lines: structure of, 62; analysis of with interferometer, 73.
- Spectrum, 60; of sodium, 61, 78; of hydrogen, 78; of thallium, 79; of mercury, 80; of cadmium, 81; order of, 121.
- Standards of length, 86.
- Star discs: size of, 143.
- Struve: Jupiter's satellites, 142.
- Telescope: efficiency of, 25; limit of resolution of, 29, 130.
- Thallium: analysis of radiations of, 79.
- Tuning-forks: beats formed by, 12.
- Undulatory theory, 44.
- Uranus: discovery of, 24.
- Vacuum tubes: as sources of light, 75.
- Velocity: of wave motion, 8, 146; of light, 146.
- Visibility: defined, 68; curves with the interferometer, 70; with the double slit, 139.
- Vortex theory, 161.
- Wave length: definition of, 7; measurement of, 17; as standard of length, 84.
- Wave motion, 3; kinetic model of, 4; Kelvin's dynamic model of, 5; propagation of, 7.
- Wheatstone: velocity of light, 48.
- Young: interference, 22.
- Zeeman: action of magnetism on light, 107.
- Zinc: spectrum of, 62.