Manual of Modern Surveying Instruments And Their Uses Containing Useful Informa

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Manual of Modern Surveying Instruments And Their Uses Containing Useful Informa
A Lietz
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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.


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