A Treatise on Optics; or, light and sight, theoretically and practically treated; with the application to fine art and industrial pursuits |
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Page 109
... disc of tourmaline with parallel faces , so cut that the optic axis is parallel to these faces ; and the tube H contains a bundle of plates of glass , with parallel surfaces placed in contact with each other , and obliquely inclined to ...
... disc of tourmaline with parallel faces , so cut that the optic axis is parallel to these faces ; and the tube H contains a bundle of plates of glass , with parallel surfaces placed in contact with each other , and obliquely inclined to ...
Page 134
... disc of light thrown by the lantern on the screen has a central dark spot , the distance between the lamp and the lenses must be increased ; if the disc has a dark edge , the lamp must be brought nearer the lenses ; if a dark shadow ...
... disc of light thrown by the lantern on the screen has a central dark spot , the distance between the lamp and the lenses must be increased ; if the disc has a dark edge , the lamp must be brought nearer the lenses ; if a dark shadow ...
Page 146
... disc of brass , perforated with circular apertures of varying diameters , the centres of which are at equal distances from its centre of rotation . In order to substitute one aperture of the diaphragm for another , it is only necessary ...
... disc of brass , perforated with circular apertures of varying diameters , the centres of which are at equal distances from its centre of rotation . In order to substitute one aperture of the diaphragm for another , it is only necessary ...
Page 147
Edward Nugent (C.E.). presses on the disc , and catches by its extremity in shallow notches , so that a shock is felt when the centre of each aperture of the diaphragm corresponds with the axis of the objective . Mr. Dallmeyer's new ...
Edward Nugent (C.E.). presses on the disc , and catches by its extremity in shallow notches , so that a shock is felt when the centre of each aperture of the diaphragm corresponds with the axis of the objective . Mr. Dallmeyer's new ...
Page 179
... disc ; by which contrivance , together with sliding the diaphragm up more or less under the stage , every necessary variation can be made . To illuminate opaque objects the light is thrown upon them from above by a small condensing lens ...
... disc ; by which contrivance , together with sliding the diaphragm up more or less under the stage , every necessary variation can be made . To illuminate opaque objects the light is thrown upon them from above by a small condensing lens ...
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Common terms and phrases
achromatic acid actinic angle of incidence aperture apparatus Argand lamps axis blue body called camera centre cloth colour combination construction converging convex lens cornea crown crown-glass crystal crystalline crystalline lens curvature diameter diaphragm direction disc dispersive power diverging Edition Engravings equal eye-glass fall Fcap flint flint-glass focal distance focal length foci focus gilt edges glass heliostat horizontal illumination Illustrations inches inclined index of refraction lamp lantern lenses limb magnifying power meniscus microscope object-glass observer obtained optical instrument oxyhydrogen paper parallel rays passing pencil perpendicular Phenakistoscope photographic picture placed plane plate polarised prism produced radius radius of curvature rays of light reflected reflector retina screen screw seen shown in Fig side Sir David Brewster slides solar spectrum speculum spherical aberration substance surface telescope theodolite tion transparent tube violet visible vitreous humour yellow
Popular passages
Page 74 - To the same degree of Refrangibility ever belongs the same colour, and to the same colour ever belongs the same degree of Refrangibility.
Page 12 - This amounts to the same with saying, that, in the case before us, the sine of the angle of incidence is to the sine of the angle of refraction in a given ratio.
Page 5 - THE PRINCE OF THE HOUSE OF DAVID; or, Three Years in the Holy City.
Page 26 - Lamborn. 2s. 134. METALLURGY OF SILVER AND LEAD, by RH Lamborn. 2s. 135. ELECTRO-METALLURGY, by A. Watt. Is. 6d. 138. HANDBOOK OF THE TELEGRAPH, by R. Bond. Is. 143. EXPERIMENTAL ESSAYS— On the Motion of Camphor and Modern Theory of Dew, by C. Tomlinson. Is.
Page 102 - Thus, if the light be homogeneous, a bright line of light will be formed under the centre of the opaque object AB, outside which will be dark lines, and then bright and dark lines alternately. If the arrangement of these lines be examined, they will be found to be hyperbolic, as exhibited in Jig.
Page 74 - ... very little of the violet. The yellow space, which has not been much absorbed, has increased in breadth. It occupies part of the space formerly covered by the orange on one side, and part of the space formerly covered by the green on the other. Hence it follows, that the blue glass has absorbed the red light, which, when mixed with the yellow light, constituted orange, and has absorbed also the blue light, which, when mixed with the yellow, constituted the part of the green space next to the...
Page 26 - EMMENS. is. 6d. 152. PRACTICAL HINTS FOR INVESTING MONEY. With an Explanation of the Mode of Transacting Business on the Stock Exchange. By FRANCIS PLAYFORD, Sworn Broker.
Page 24 - Is. 34. STEAM ENGINE, by Dr. Lardner. Is. 59. STEAM BOILERS, their Construction and Management, by R. Armstrong. With Additions by R. Mallet. Is.
Page 73 - Coloured fluids, such as black and red ink, though equally homogeneous, stop or absorb different kinds of rays, and when exposed to the sun they become heated in different degrees ; while pure water seems to transmit all the rays equally, and scarcely receives any heat from the passing light of the sun. When we examine more. minutely the action of...
Page 26 - Is, 79**. PHOTOGRAPHY, the Stereoscope, &c., from the French of D. Van Monckhoven, by WH Thornthwaite. Is. Gd. 96. ASTRONOMY, by the Rev. R. Main. New and Enlarged Edition, with an Appendix on