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202.2. directae, at right angles with the course of the wall.—perpetuae in longitudinem, along the whole length. 202.4.

revinciuntur, are fastened by beams some forty feet in length, running lengthwise of the wall. 202.5.

intervalla: i.e. the two feet between each two of the beams in the lower tier (ordo). 202.7.

ut idem, etc., in such a way that the same space (between the beams) is preserved, and that the beams do not touch each other; but, placed at equal intervals, the individual beams are firmly bound together by the corresponding stones placed between them; i.e. so alternating in the successive layers that beams rested on stone, and stone on beams. 202.11.

cum: correlative with tum below. 202.15.

quadragenum: note the distributive, forty each. 203.1.

introrsus revincta: i.e. the beams were mortised together at some distance from the exposed ends, making it next to impossible to force them apart; see Fig. 94.


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