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IN Iron-work Furnaces are the greatest and most regular moving Bellows that are any where used; the which are commonly turned by the evenest over∣shot Wheels. Now the Times wherein these Bel∣lows rise and fall, are Roots of the Strength of such Bellows-blast upon
the fire; for rising in double Quickness admits double air in the same Time; which being in like manner squeezed out a∣gain, double Quickness makes double Expulsion, and consequently double Swiftness; (the whole pas∣sing through the same Twire-pipe in half the time;) and double Swift∣ness makes quadruple ef∣fects upon the fire or Fur∣nace, as aforesaid.