Cugle, Charles Hurst. [from old catalog], Jones, Bradley. [from old catalog] · New York, E.P. Dutton & company · leaf 69
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 DIAGRAM 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…
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-120-333.webp)
