Publisher's Synopsis
Excerpt from The Panoramic Camera Applied to Photo-Topographic Work
With the transit set up over a station from which a broad view may be Obtained, Sight on some prominent point and then take angular readings to other points and note several points Of equal elevation to the station occupied. Set up the camera over this station, sight the attached alidade on the first point sighted with transit, and then take view. After development of the negative a comparison of the readings is made. If the zero Of the horizontal scale does not fall directly over the point sighted with the alidade, shift the scale or alidade to the amount of difference indicated on the negative. If the points of equal elevation noted by the transit-readings do not fall on the hori zon-line represented on the vertical scales, it is a simple matter to adjust either the scales or the levels until such is the case. To make this latter adjustment perfect may require several trials.
A simpler way to adjust the vertical scales, and a test that should be made from time to time in the field, is to set up the camera on the shore-line of a lake or at sea-level and make an exposure; the horizon-line indicated by the vertical scales should coincide with the surrounding shore-line of the lake or the horizon-line of the sea. If this is not the case, the scales should be adjusted until harmony exists.
With the present camera adjustments for determining the parallelism of the film to the axis on which the lens revolves cannot be made. A camera, however, is under construction in which this and other adjustments will be possible.
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