London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 208
the keys (g) whichpass down through the whole course, and are inserted 2 in. inthe middle of the stones of the courses immediately below. Fig. 93. is a plan of the smaller diameter of the shaft. Inthis plan the thickness of the outer wall is, from the diminutionof the column, only 1 ft, 10^ in. The… … • • : r -wm : ^^-Jll^ ft • ■
Architecture
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