How to Work with the Spectroscope: A Manual of Practical Manipulation with Spectroscopes of All Kinds . ..

J. Browning, 1902 - Spectroscope - 74 pages

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Contents

 Total Reflection 105 The Diffraction Grating 108 The Concave Grating 116
 Appendix 183 Index 194

Popular passages

Page 85 - The general conclusion of philosophers seems to be, that such cases are by far the moat numerous, and for my own part, considering the relation of a vacuum to the magnetic force and the general character of magnetic phenomena external to the magnet, I am more inclined to the notion that in the transmission of the force there is such an action, external to the magnet, than that the effects are merely attraction and repulsion at a distance. Such an action may be a function of the ether ; for it is...
Page 85 - Such an affection may be a function of the ether ; for it is not at all unlikely that, if there be an ether, it should have other uses than simply the conveyance of radiations.
Page 82 - A ray of light is reflected from a straight-line mirror in such a way that the angle of incidence is equal to the angle of reflection (that...
Page 88 - K = i in electrostatic units and /* = i in electromagnetic units. Hence c = v for the ether, or the velocity of an electromagnetic wave in the ether is equal to the ratio of the cgs electromagnetic to the cgs electrostatic unit of electric charge. This constant c is of primary importance in electrical theory.
Page 43 - ... pairs of rays starting from the source and reaching P, after reflection from the mirrors — a pair of rays signifying two rays which have started from the same point of the source. If the area of the luminous surface is sufficiently large, the illumination at P will be independent of the distance...
Page 53 - NICOL until the ordinary ray disappears, and reading the circle again ; the difference between the two circle readings is the angle through which the plane of polarization has been...
Page 73 - The index of refraction is usually defined as the ratio of the velocity of light in vacuo to the velocity in the medium in question.
Page 48 - The rotation is proportional to the thickness of the active medium traversed and the rotatory power is defined as the angle through which the plane of polarization is turned per unit path in the medium.
Page 63 - Morley, Ed. W., and W. Rogers. The measurement of the expansion of metals by the interferential method. Phys. Rev. 4 (1896) 1—23, 106-127. Moses, AJ, und E. Weinschenk. Eine einfache Vorrichtung zur Messung der Brechungsexponenten kleiner Krystalle mittels Totalreflexion. Ztsch. Kryst. u. Min. 26 (1896) 150-156. Mouchez. Photographies spectrales d'étoiles de MM. Henry, de l'observatoire de Paris. C.-R.
Page 43 - Which when the axes include an angle of 180°? Since the position of the upper crystal when Ee disappears differs by 90° from its position when Eo disappears, these two rays are said to be polarized in planes at right angles to each other.