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Where safe working platforms are used and the risk of a fall remains, travel restraint and fall-arrest harnesses can be used where a suitable point of attachment exists. Harness systems, anchor points and shock absorbing lanyards must be compatible at each point of attachment from the anchor point to the harness, with approved and rated latching devices to ensure the integrity of the system.
Heron of Alexandria in his study listed the five mechanisms as the lever, windlass, pulley, wedge, and screw, which were known to set a load in a motion. Flemish engineer Simon Stevin derived the mechanical advantages of the inclined plane that was merged with the simple machines. Leonardo da Vinci also contributed to the study of machines by discovering the classic rules of sliding friction.
Examples of separation include: • physical barriers and guards, such as fences, screens or fixed panels of various materials • various forms of guarding and interlocking (as described in AS4024, parts 1601 and 1602, Safety of Machinery) • making the hazard inaccessible by reach (where the distance between a person and the hazard forms an effective barrier).
• Separating people from non-mechanical hazards is necessary where the emission cannot be controlled at the source through elimination or substitution. Hazardous machinery and equipment emission controls rely largely on isolating of people from the hazardous emission. Hoods, lids, covers or impervious guards (solid barriers that prevent escape of the emission) can serve to contain a number of different types of emissions within machinery and/or equipment.