Line of Direction
The line in which a body moves, a force acts, or motion is
communicated. In order that a body may stand without falling, a line
let down from the centre of gravity must fall within the base on which
the object stands. Thus the leaning tower of Pisa does not fall,
because this rule is preserved.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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