Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 79
A NEW PRISMATIC STADIA. 45 distauce from the telescope to any given point will be proportional to the space between the lines at that point (see Fig. 3). The method of measuring these spaces will be described later under targets. In Fig. 3 0 is the objective of the telescope. P is the prism for… … Fig. 4o. Fig. Ah. Improper Combination. Proper Combination. Fig. Aa represents what appears to me to be the rational and proper mode of combining the prism and the objective ; while Fig. 46 shows an improper combination. With the arrangement shown in Fig. 3 the bent rays will be exact counterparts…
Engineering
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