Section 39.21. Machinery—general precautions

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(a) No wrench or other tool should be left on a lathe chuck when the operator leaves a machine, as someone else may start the machine and be injured by the object flying off.
(b) In order to avoid accidental injury, no employe should engage a fellow worker in conversation while either is operating a hazardous machine.
(c) No employe should attempt to operate any machine or apparatus unless he is familiar with its operation, and has been so directed by the foreman or other authorized person.
(d) Extra hazardous operations should have watchmen stationed to warn all persons who may be endangered, especially where overhead operations are being carried on.

                    
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