Photographic Surveying: Including the Elements of Descriptive Geometry and Perspective |
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Photographic Surveying: Including the Elements of Descriptive Geometry and ... E. Deville No preview available - 2015 |
Common terms and phrases
aB₁ altitude anastigmatic arc of circle astigmatic axis bromide paper camera centre construction corresponding curve density diaphragm dicular direction distance line drawn edge enlarging equal exposure figure focal length focus front plane given line ground glass ground plane height horizon line horizontal plane horizontal projection horizontal trace Hurter and Driffield instrument inter join lens lenses let fall light line parallel logarithm M₁ measuring line millimetres negative obtained opacity parallel lines pencil pendicular perpen perpendicular to XY perspective picture plane placed plane containing plane PaP plane perpendicular plane table planes of projection plate plotted point of intersection position principal plane principal point produced projecting plane refracted represented revolved rotated S₁ scale screen screws side slide spective station straight edge straight line tangent tion trace aP triangle trihedral angle vanishing point vertical plane vertical projection vertical trace visual ray
Popular passages
Page 6 - A\ scribe with the same radius two arcs cutting each other in D : through D and the centre C draw CD: the angle ACE will be equal to the angle ECB, and the arc AE to the arc EB.
Page 35 - ... cylinder be cut by a plane parallel to the base, the section is a figure parallel and similar to the base. The one point a...
Page 187 - ... intensity of two. The light received by a landscape in direct sunshine consists of: I, Direct rays of the sun; 2, The light diffused by the sky. As a result there is considerable change in the exposures required at the same time of day at sea-level and at great altitudes. It has been found that there is little change in the exposures required at great elevations until the sun approaches the horizon. According to Mr. E. Deville, taking the exposure with the sun at the zenith as one second at sea-level,...
Page 55 - ... duties as teachers. The next step forward should be to require at least two years of purely college work above and beyond the ordinary high-school course. It may be said that many of our colleges and universities, thru their chairs and departments of education, are already providing such teachers. But, in the first place, it may be observed that there is no immediate prospect that the colleges and universities will be able to supply anything like the number of teachers required. In the second...
Page 159 - It may be surmised that the number of particles of bromide of silver affected by the light is greatest in the front layer of the film, and decreases in geometrical progression as each succeeding layer of the film is reached, an idea which will be better appreciated when the action of light upon the film is explained.
Page 18 - DISTANCE FROM A POINT TO A PLANE. — The distance from a point to a plane...
Page 149 - In its application to negatives, the density is directly proportional to the amount of silver deposited per unit area, and may be used as a measure of that amount. The relations between the three terms, transparency, opacity, and density, are the following : — T= -~D O = 2" # = %£<?= -log2T The density is the logarithm of the opacity or the negative logarithm of the transparency.
Page 149 - Priffield have satisfied themselves that they do hold good for the silver deposited as a black substance in negatives, so long as the silver does not assume a metallic lustre and reflects but a very small amount of light.
Page 149 - The result is this : in a theoretically perfect negative, the amounts of silver deposited in the various parts are proportional to the logarithms of the intensities of light proceeding from the corresponding parts of the object.
Page 165 - Fig. 212, where the densities are the ordinates, the logarithms of exposures are abscissae, and the period of correct representation a straight line. Dozens of plates were measured, and the densities falling within this period were found to conform to the very simple linear equation : D — r [Log It ± C] D being the density, ya constant depending on time of development, It the product of intensity of light and time, ie, the " exposure," and C a constant depending upon the speed of the plate.