London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 116
inside frame to open. Now, if he places the point of one leg of his dividers inthe centre of the hinge at a, and extends the point of the other leg diagonallyacross to the opposite internal angle, he will find, by describing an arc from Retrospective Criticism. 95 … the centre (a), that thediagonal from a to theopposite internal angleis longer, by, perhaps,three inches, than thedistance from a to c;consequently, the innerframe is locked up, andthe casement may be,for aught I know, bothwatertight and airtighttoo. — Augustine. C. B. W:s original De-sign for a…
Architecture
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