Gear's illustrated catalogue of wood and iron working machinery (1872)
A.S. Gear, Gear, A. S · Boston : Printed at A.S. Gear's printing office, 62 Sudbury Street · leaf 120
ik6l\ii\e. … This machine runs seven taps, with three different speeds, and is so arranged that two of the taps may be runwith the fastest, two with the slowest, and three at medium speed, at the same time—the gearing being so arrangedas to enable the operator to get the desired speed for any given sized tap;…
