[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 169
ormulas may be modified so as to facilitate computation.Put <brr=h+Ah then, changing the 2d of (125) to a logarithmic form, wehave log sin (h+A h) = log sin h + log cos <£ — log cosp>or log sin (h+A h) — log sin h = log seep — log sec 0. But A h being very small, representing by D;/ the… … Jh = Dm D. (127) LATITUDE BY CIRCUM-MERIDIAN ALTITUDES. 163 The difference of the log secants, or log cosines, of p and $is readily taken from the table by inspection. D;/ for log sin#is usually given in tables of 7 decimal places, and henceA h is readily found. We have then 0==pOOfl.t \ (12S) If…
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