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What is "multiplying gear"

The Collaborative International Dictionary
Multiplying gear

Multiply \Mul"ti*ply\, v. t. [imp. & p. p. Multiplied; p. pr. & vb. n. Multiplying.] [F. multiplier, L. multiplicare, fr. multiplex manifold. See Multitude, Complex.]

  1. To increase in number; to make more numerous; to add quantity to.

    Impunity will multiply motives to disobedience.
    --Ames.

  2. (Math.) To add (any given number or quantity) to itself a certain number of times; to find the product of by multiplication; thus 7 multiplied by 8 produces the number 56; to multiply two numbers. See the Note under Multiplication.

  3. To increase (the amount of gold or silver) by the arts of alchemy. [Obs.]

    Multiplying gear (Mach.), gear for increasing speed.

    Multiplying lens. (Opt.) See under Lens.