The New Zealand Railways Magazine, Volume 3, Issue 2 (June 1, 1928)
12. Machinery
12. Machinery.
(a) See that everybody and everything is clear before starting up a machine or moving heavy loads. Watch the other fellow.
(b) Replace all guards before starting the machine. Guard off, danger on.
(c) Always stop machinery before oiling, adjusting, inspecting or repairing it. A motionless machine is harmless.