Cugle, Charles Hurst · New York : E.P. Dutton · leaf 65
when they become parallel to the compass needle. Steel athwartship magnets produce their greatest effecton North and South, diminishing to nothing on East andWest, when they become parallel to the compass needle. Quadrantal correctors produce their greatest effect onN E; S E; S W; and N W; tapering… … EXPLANATION BELOW WILL EXPLAIN DUGRAM No. 1. The complement of an arc is 90° minus the arc.Thus B C is the complement of the arc A C. No. 2. The supplement of an arc is 180° minus thearc. Thus F H is the supplement of the arc A B F. No. 3. The sine of an arc is the perpendicular let fallfrom one…
Navigation -- Problems, exercises, etc
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
