St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments (1885)
Ruskin, John, 1819-1900 · New York : Lovell · leaf 404
h and a k. ThenF n and f m are horizontal lines across the pyramid at thelevel r, forming at that level two sides of a square. Complete the square, and within it inscribe a circle, as inFig. 62., which is left unlettered that its construction maybe clear. At the extremities of this draw vertical… … FiQ. 61.
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