Elements of surveying and navigation : with a description of the instruments and the necessary tables (1847)
Davies, Charles, 1798-1876 · New York : A.S. Barnes & Co. · leaf 177
whosecircumference is di-vided into thirty-twoequal parts calledpom^5; each point be-ing subdivided intofour equal parts call-ed quarter points. To the under sideof this card a slenderbar of magnetizedsteel, called a needle,is permanently at-tached. The direc-tion of the needlecorresponds to… … PHINCIPLES OF NAVIGATION, 173 by eastj north north east, north east and by north, north east;and so on, round the compass, as indicated by the letters. The card being permitted to turn freely on the pin, on whichit is poised as a centre, the line NS will always indicate thetrue magnetic meridian,…
Surveying · Navigation
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