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Seite 78 - Any given regular periodic form of vibration can always be produced by the addition of simple vibrations, having vibrational numbers, which are once, twice, thrice, four times, etc., as great as the vibrational number of the given motion.
Seite 80 - He succeeded in obtaining photographs of the curves on the wax cylinder, a beam of light reflected from a small mirror attached to the vibrating disc of the phonograph being allowed to fall on a sensitive plate while the phonograph was slowly travelling.
Seite 73 - In each case a compound tone was produced which retained the same pitch so long as the wheel revolved at the same rate. By keeping the wheel revolving at a uniform rate, and at the -same time changing the length of the spring which was allowed to vibrate, Willis found that the qualities of various vowels were imitated with considerable distinctness. In 1837 Wheatstone,'' in a criticism of Willis, made some important suggestions.
Seite 521 - Sellmeier'a theory, imagine for each molecule of sodium -vapour a spherical hollow in ether, lined with a thin rigid spherical shell, of mass equal to the mass of homogeneous ether which would fill the hollow. This rigid lining of the hollow we shall call the sheath of the molecule, or briefly the sheath. "Within this put two rigid spherical shells, one inside the other, each movable and each repelled from the sheath with forces, or distribution of force, such that the centre of each is attracted...
Seite 4 - Infirmary, and in 1876 he obtained the Chair of Practice of Medicine in Anderson's College, Glasgow. In 1880 he was appointed to the Chair of Materia Medica and Therapeutics in the University of that city. He was well known to the profession for his researches into salicylic acid and chloroform.
Seite 421 - Although inferences as to the role of a-toxin are based upon circumstantial evidence, there can be little doubt of the relation of staphylococcal enterotoxin to food poisoning. The food poisoning strains represent one of the few instances in which it has been possible to associate particular phage types with a disease entity, for essentially all such strains either show a typing pattern in Group III or are of type 42D. It is of some interest from an epidemiological standpoint that it has been possible...
Seite 44 - No gas lit, but wire on the electrometer as in the other tests* In place of the metal point, a round disc of zinc, 8 centimetres in diameter, was fixed, as shown in fig. 3, to the end of another steel wire of the same length ; and leakage from it to the flame above it, observed. For the same distance between the flame and either the point or the metal disc, the rate of leakage through the same difference of potential, was less for the point than for the disc. Thus with the flame 25 centimetres above...
Seite 630 - Hence the time-integrals of the opposite electromotive forces on units of the equal vitreous and resinous electricities are each equal to AM. § 2. Substitute now for our metal wire an endless tube of non-conducting matter, vitreously electrified, and filled with an incompressible non-conducting fluid, electrified with an equal quantity, e, of resinous electricity. The fluid and the containing tube will experience equal and opposite tangential forces, of each of which the time-integral of the line-integral...
Seite 43 - ... rate of fall of potential in one minute from 240 volts diminished as the distance of the flame above the point was increased. When the vertical distance of the flame above the point was 15 centimetres, or more, the time of leakage from 240 volts was practically the same as if the flame was not lit at all. A plate of metal, glass, paraffin, or mica, put between the point and the flame, diminished the rate of leakage.
Seite 74 - showed that the cavity of the mouth, as arranged for the giving forth of a vowel, was tuned as a resonator for a tone of a certain pitch, and that different pitches corresponded to the forms of the cavity for the different vowels. This he discovered by the peculiar noise produced in the mouth when the different vowels are whispered.