Letter, from John Beale to Henry Oldenburg Concerns sending Mr Strode of Maperton's (Somerset) new way of measuring a triangle whose sides are given in numbers without finding a perpendicular The latter part of Strode's work is attached Oldenburg endorsed this letter: 'The inclosed of Mr Strodes I sent back to him upon the desire of Dr Beale, after it was enter'd in our 6th Letter book, pag. 215' 28 July 1673