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 434
^SMm … For use in Gas Works for removing the gas from the retorts to the gasometer,and in Lead Works for forcins; carbonic acid gas into the corroding rooms, and also,for use in Chemical Works where any kind of gas is to be distributed.
