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 125
ttMttff^f^ rkterit reffedt G^oYefi\of ^i\d Vklve, … S^of ^tktioi}kiy ^tekrq 5}r|^i|e^. The particular invention in this Governor consists in relieving the joints of the weight of the balls, and the fric-tion caused by rotating them; also, in dispensing with the gravity principle, as the balls do not rise and fall butalways revolve on the same plane.…
