For the condition of equilibrium of forces not parallel is that they shall be represented in direction and magnitude by the sides and diagonals of certain parallelograms, and of parallel forces that they shall divide certain straight lines in certain ratios; and the parallel projection of a parallelogram is a parallelogram, and that of a straight line divided in a given ratio is a straight line divided in the same ratio.
They are well constructed of regular parallelograms of a sandy tufa, laid in headers and stretchers.
Parallelograms," in Lehmann's Beitrdge, i.
Regling, "Zur historischen Geographie des mesopotamischen Parallelograms" (Sarug district), in Klio, I.
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