119 X. THE ARCH LINE. CONSTRUCTION. not a chance of the stone in the middle pushing the others out, or tilting them up and aside, and slipping down itself between Fig. XXIX. 11 i '3 c … \ 7 m-i them ? There is such a chance : and if, by somewhat altering the form of the stones, we can diminish this chance, all the better. I must say " we " now, for perhaps I may have to help the reader a little. The danger is, observe, that the midmost stone at / pushes out the side ones : then if…
Architecture
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