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 53
Chisels for Power Mortiser, No. 2. SELF-SPACING AND SELF-FEEDING. By the use of the above machine the labor of laying out the holes is entirely dispensed with, being provided with apawl and ratchet, and so arranged that the same ratchet (or notched stick) used in the Blind Wiring Machine can alsobe…
