scales, compasses, dividers

Webster's Dictionary (GCIDE)

Proportional \Pro*por"tion*al\, a. [L. proportionalis: cf. F. proportionnel.]

1.Having a due proportion, or comparative relation; being in suitable proportion or degree; as, the parts of an edifice are proportional. --Milton. [1913 Webster]

2.Relating to, or securing, proportion. --Hutton. [1913 Webster]

3.(Math.) Constituting a proportion; having the same, or a constant, ratio; as, proportional quantities; momentum is proportional to quantity of matter. [1913 Webster]

Proportional logarithms, logistic logarithms. See under Logistic.

Proportional scale, a scale on which are marked parts proportional to the logarithms of the natural numbers; a logarithmic scale.

Proportional scales, compasses, dividers, etc. (Draughting), instruments used in making copies of drawings, or drawings of objects, on an enlarged or reduced scale. [1913 Webster]