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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
spectrum is thrown on a screen in a closed box and is photographed, admitting of ready comparison with the previously photographed spectra of other alloys containing known proportions of the metals. By means of a delicate scale attached to the instrument, the coincidence or variation of the lines in the different spectra, arranged one above the other, is determined, the relative length, strength, and position of these lines indicating the proportion of each metal contained in the alloy. Huggins has applied spectroscopic observation to the determining of the proper motion of the heavenly bodies, by observing the displacement of the spectral lines. Spec′u-lum. 1. (Surgical) An instrument for dilating certain passages of the body, in order to enable examinations or access of instruments for operation. Speculums are known by their construction, as bivalve, four-bladed valve, etc., or by the part of the body to which they are applicable, as— Anal,Eye,Nasal,Vaginal, Ear,M
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
t is spread out into a band by a cylindrical lens a. A movable mirror f is placed above the slit of the spectroscope, by means of which the light of the spark passing from the metallic poles held between metal holders is reflected by the small prism e placed on the slit into the optical arrangement, and is received into the eye, the metal spectrum being ranged close above that derived from the star, so that the coincidence or otherwise of the two sets of lines can be accurately observed. Huggins's Telespectroscope. Tel′e-ster′e-o-scope. An instrument described by Helmholtz, 1857, for producing an appearance of relief in the objects of a landscape at moderate distances. It consists of a frame on which are set at a convenient distance — say 4 1/2 feet — apart two plane mirrors at an angle of 45°, which receive the rays of light from the objects; these are reflected to two central mirrors, forming an angle of 45° with the first, in which they are viewed by the eye. The ef