Manual of Modern Surveying Instruments And Their Uses Containing Useful Informa
Manual of Modern Surveying Instruments And Their Uses Containing Useful Informa
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In our eReader you can find the full English version of the book. Read Manual of Modern Surveying Instruments And Their Uses Containing Useful Informa Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Manual of Modern Surveying Instruments And Their Uses Containing Useful Informa
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To quickly assess the difficulty of the text, read a short excerpt:
Optical Features and the Constants c and k.
Certain optical principles do not admit of a stadia measurement from the point occupied by the center of the instrument, but from a point outside of the objective lens, equal in distance to its focal length. This gives rise to a certain value by which the stadia distance must be increased, and which may be practically a constant for any length. It may be determined with sufficient accuracy by adding two meas- urements, taken with an ordinary scale or ...tape, from the object glass of the tele- scope, when the latter is focused to a distant object: one to the capstan-headed screws, holding the diaphragm with the cross-hairs, and the other to the center of the axis. The sum of these two (f-\- h, figure 1) is the constant c, which must be added to every horizontal distance, irrespective whether long or short.
In figure 1, let a =any rod reading, K = a constant expressed by the relation of the distance between the stadia threads and the focal distance of the object glass, then K a = d distance from the focal point to the rod, for 8 : / : : a : d, or (1) wherein _Z_ represents the constant K.
What to read after Manual of Modern Surveying Instruments And Their Uses Containing Useful Informa?
You can find similar books in the "Read Also" column, or choose other free books by A Lietz to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Optical Features and the Constants c and k.
Certain optical principles do not admit of a stadia measurement from the point occupied by the center of the instrument, but from a point outside of the objective lens, equal in distance to its focal length. This gives rise to a certain value by which the stadia distance must be increased, and which may be practically a constant for any length. It may be determined with sufficient accuracy by adding two meas- urements, taken with an ordinary scale or ...tape, from the object glass of the tele- scope, when the latter is focused to a distant object: one to the capstan-headed screws, holding the diaphragm with the cross-hairs, and the other to the center of the axis. The sum of these two (f-\- h, figure 1) is the constant c, which must be added to every horizontal distance, irrespective whether long or short.
In figure 1, let a =any rod reading, K = a constant expressed by the relation of the distance between the stadia threads and the focal distance of the object glass, then K a = d distance from the focal point to the rod, for 8 : / : : a : d, or (1) wherein _Z_ represents the constant K.
What to read after Manual of Modern Surveying Instruments And Their Uses Containing Useful Informa?
You can find similar books in the "Read Also" column, or choose other free books by A Lietz to read onlineMoreLess
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