Chambers's encyclopaedia; a dictionary of universal knowledge for the people . ing on rude piers,their tops leaning against eacli other, and thus forming two sidesof a triangle, which is capable of su|)porting a moderate superin-cumbent weight. The mechanical principles on which the A. de-pends, thougli here very imperfectly employed, seem sutficiently 272 AECH—ARCHEOLOGY. called into play to suggest their more extensive application; andit is not impossible that out of this rude construction the A., in itslater and more elaborate forms, might have developed itselfamongst ourselves without hint
Chambers's encyclopaedia; a dictionary of universal knowledge for the people . ing on rude piers,their tops leaning against eacli other, and thus forming two sidesof a triangle, which is capable of su|)porting a moderate superin-cumbent weight. The mechanical principles on which the A. de-pends, thougli here very imperfectly employed, seem sutficiently 272 AECH—ARCHEOLOGY. called into play to suggest their more extensive application; andit is not impossible that out of this rude construction the A., in itslater and more elaborate forms, might have developed itselfamongst ourselves without hints from foreign sources. Of the A. itself, the following variations of form may be enu-merated : The semicircle (1), the segment (2), the ellipse (3).which were tlie only forms employed by the ancients, and whichalone were known in medieval architecture up to the time at whichtlie pointed A. was introduced. Of these, the stilted A. (4), andthe horseshoe A. (5), are modifications, in both of which the cen-ter or point from which tlie A. is described is above the line of the. 6. Equilateral A. 7. Lancet A.
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Keywords: ., bookcentury1800, bookdecade1880, bookidchamberssenc, bookyear1888
