A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 187
ABD we have AD : AB :: sin. ABD : sin. ADB,and in ABC we have AB : AC :: sin. ACB : sin. ABC. Whence (23.6) AD : AC :: sin. ABD. sin. ACB : sin. ADB .sin. ABC. Then, in CAD having the ratio of AC to AD and theangle CAD, we may find the other angles by Art. 141,thus:— As AD : AC, or sin. ABD. sin.… … Thus,and sin. CAD : sin. ACD :: CD : AD,sin. ABD : sin. ADB :: AD : AB. Whence (23.6) sin. CAD . sin. ABD : sin. ACD. sin. ADB: CD : AB. Sec, III.] OBSTACLES IN COMPASS SURVEYING. 185 Examples. To determine the distance AB, accessible at its extremi-ties, I took the angles to the ends of a line CD…
Surveying
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