Barrow, Isaac, 1630-1677, Child, J. M. (James Mark), tr · Chicago, London : The Open court publishing company · leaf 229
. 10 (i). Let N^^ be the ordinate for the given abscissa, ^F,6J the given subtangents ; let tttt be a curve such thatR. Ntt = N(^. N^; find NP, a fourth proportional toNF+NT, NF, NT; then Ptt will touch the curve tttt. [Seenote on page 112, rule (i).] 2o8 BARROWS GEOMETRICAL LECTURES
Geometry
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