How to Work with the Spectroscope1882 - 54 pages |
Common terms and phrases
absorption bands achromatic adapted Aneroid arranged attached Automatic Electric Lamp Automatic Solar Spectroscope Barometer Becquerel's Apparatus Bessemer process Bessemer Spectroscope Bisulphide of Carbon bright lines Browning's Spark Condenser carbon crucibles Carbon Prisms carbon rods clamp coloured convex lens diagram Direct-Vision Spectroscope dispersive power ditto dry air equatorially mounted extra eye-piece field of view flame focus Fraunhofer lines gases give inch Speculum Induction Coil instrument Insulated Spark Apparatus JOHN BROWNING knife edges lens Leyden Jar light liquids Lockyer's Mahogany Map a Spectrum McClean's Star Spectroscope Micro-Spectroscope Micrometer Microscope milled head Miniature Spectroscope Model Spectroscope nozzles object object-glass observer obtaining the Spectra Parabolic Reflector placed plate platinum wire Professor Smyth quart Bunsen's Cells quart-size Bunsen's Cells R. A. PROCTOR RAIN Rain-band Spectroscope reflecting prism SCREEN SPECTRUM APPARATUS screw motion showing sliding solar prominences solar spectrum spark in dry SPECTROSCOPES SPECTROSCOPES SPECTROSCOPES Spectrum Analysis stand Student's Spectroscope substance Varnished Oak Trays
Popular passages
Page 35 - SCHELLEN'S SPECTRUM ANALYSIS, in its application to Terrestrial Substances and the Physical Constitution of the Heavenly Bodies. Translated by JANE and C. LASSELL; edited, with Notes, by W. HUGGINS, LL.D. FRS With 13 Plates (6 coloured) and 223 Woodcuts. 8vo. price 28s. CELESTIAL OBJECTS for COMMON TELESCOPES.
Page 29 - Remove a, and open the slit by means of the milled head, not shown in cut, but which is at right angles to d d. When the slit is sufficiently open, the rest of the apparatus acts like an ordinary eyepiece, and any object can be focussed in the usual way. Having focussed the object, replace a, and gradually close the slit till a good spectrum is obtained. The spectrum will be much improved by throwing the object a little out of focus. Every part of the spectrum differs a little from adjacent parts...
Page 29 - E, square-headed screw, opening and shutting a slit to admit the quantity of light required to form the second spectrum. Light, entering the round hole near E, strikes against the right-angled prism which we have mentioned as being placed inside the apparatus, and is reflected up through the slit belonging to the compound prism. If any incandescent object...
Page 29 - ... is a tube made to fit the microscope to which the instrument is applied. To use this instrument, insert g like an eyepiece in the microscope tube, taking care that the slit at the top of the eyepiece is in the same direction as the slit below the prism. Screw on to the microscope the object-glass required, and place the object whose spectrum is to be viewed on the stage. Illuminate with stage mirror if transparent, with mirror and Lieberkiihn and darken well if opaque, or by side-reflector bull's-eye,...
Page 29 - DD, an apparatus for holding a small tube, that the spectrum given by its contents may be compared with that from any other object on the stage.
Page 29 - A side slit capable of adjustment admits when required a second beam of light from any object whose spectrum it is desired to compare with that of the object placed on the stage of the microscope. This second beam of light strikes against a very small prism, suitably placed inside the apparatus, and is reflected up through the compound prism, forming a spectrum in the same field with that obtained from the object on the stage. a is a brass tube carrying the compound direct-vision prism.
Page 30 - ... Disappointment will occur in any attempt at delicate investigation, if this direction is not carefully attended to. When the spectra of very small objects are to be viewed, powers of from \ in.
Page 20 - BROWNING'S NEW LARGE AUTOMATIC ELECTRIC LAMP. In this Lamp both carbons are moved by the electricity of the battery employed (without the aid of clockwork) ; the light remains uniform in height, and more steady in action than any of the expensive regulators previously introduced.
Page 28 - Below the prism is an achromatic eye-piece, having an adjustable slit between the two lenses ; the upper lens being furnished with a screw motion to focus the slit. A side slit, capable of adjustment, admits, when required, a second beam of light from any object whose spectrum it is desired to compare with that of the object placed on the stage of the Microscope.