Science Abstracts: Physics. Section A., Volume 10

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E. & F.N. Spon, 1907 - Physics
 

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Page 522 - URIAH A. BOYDEN, ESQ., of Boston, Mass., has deposited with THE FRANKLIN INSTITUTE the sum of one thousand dollars, to be awarded as a premium to "Any resident of North America who shall determine by experiment whether all rays of light,* and other physical rays, are or are not transmitted with the same velocity.
Page 193 - ... would immediately give rise to an instability according to which some parts of the outermost portions of the globe would sink, and upward currents would consequently be developed in other portions. In any real fluid, whether gaseous or liquid, this kind of automatic stirring would tend to go on until a condition of approximate equilibrium is reached, in which any portion of the fluid descending or ascending would, by the thermodynamic action involved in change of pressure, always take the temperature...
Page 82 - And when we deal with molecules the stopping power is simply proportional to the sum of the square roots of the atomic weights of the atoms entering into the molecule. This is the
Page 526 - ... crystal is acted on by a magnetic field the components of the resulting doublet will run into one another, and the separation will not be observed. The band, however, on the whole, will increase in breadth. This explains how, in some cases, the bands are observed merely to broaden, without being doubled. The fact that some of the bands observed broaden for some directions of the vibrations and separate for others indicates that the friction is different in different directions. If the friction...
Page 524 - ... that the recesses in this case act as resonators in a manner not covered by Fresnel's investigations, and illustrates the need of a theory more strictly dynamical. The present investigation, of which the interest is mainly optical, may be regarded as an extension of that given in ' Theory of Sound,'* where plane waves were supposed to be incident perpendicularly upon a regularly corrugated surface, whose form was limited by a certain condition of symmetry. Moreover, attention was there principally...
Page 524 - ... be verified by experiment. But now suppose that the grating interval is reduced until it is less than the wavelength of the light. The conclusion is now entirely wide of the mark. Under the circumstances supposed there are no lateral spectra and the whole of the incident energy is necessarily thrown into the regular reflection, which is accordingly total instead of evanescent. A closer consideration shows that the recesses in this case act as resonators in a manner not covered by Fresnel's investigations,...
Page 383 - The electrical theory would simply substitute the word "electrical" for the word "chemical" above. For various reasons Dr. Mills thinks that "the attractive forces . . . which proceed from a particle are definite in amount. If this attraction is exerted upon another particle the amount of the attraction remaining to be exerted upon other particles is diminished.
Page 147 - It seems no longer possible to hold that the vibratory character of sound terminates at the outer ends of the nerves along which the communication with the brain is established. On the contrary, the processes in the nerve must themselves be vibratory, not of course in the gross mechanical sense, but with preservation of the period and retaining the characteristic of phase — a view advocated by Rutherford, in opposition to Helmholtz, as long ago as 1886.
Page 464 - U-tube deflections may run up to 24 inches, and therefore need not be read with any great nicety. The photo-recorder consists of a portable box in which a drum carrying Velox paper revolves before a fine vertical slit, just in front of which is locked one leg of the U-tube in such a position that the rays of light from an...
Page 147 - ... situated 45 behind full right. A combination of three or four observers facing different ways offers advantages: a comparison of their judgments, attending only to what they think as to right and left and disregarding impressions as to front and back, should lead to a safe and fairly close estimate of direction.

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