Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 79
es. 100. K a magnetic needle be suspended freely, and allowedto settle to a state of rest, a vertical plane passed through itsaxis is called the plane of the magnetic meridian ; and its inter-section with the surface of the earth is called the magneticmeridian, or sometimes, a North and South line.… … 72 ELEMENTS OF SURVETIKG. [BOOK III meridian, passing through the point of beginning, is called theBearing. Thus, if we start from the pointA, and measure in the direction AB,the line AB is the course, and theangle NAB is the bearing. When the course, like AB, fallsbetween the north and east…
Surveying
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