By B. Shackel (Auth.)
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Extra info for Applied Ergonomics Handbook. Volume 1
Another important principle which has been established concerns the relationship between maximum force and endurance. Research has shown that the limb position in which the operator can exert the maximum force on a control is also the most favourable one for exerting a smaller force for the greatest length of time. Thus, if a particular control is placed so that the maximum force can be exerted on it, if required, then the possibility of the operator becoming fatigued is likely to be reduced to a minimum.
In designing the layout, those items on the important and frequently-used lists are placed near the centre of the console or machine, in easily accessible and well differentiated positions. The items in sub-sequences are placed together, perhaps in a row or column, and the functionally related items are similarly placed in groups together, with some visual and spatial separation from other items. Taking car dashboard controls as a simple illustration, one can suggest that the two important and frequently-used items are wipers and lights on-off; the sub-sequence is ignition-choke-starter, as noted above; and the functionally related items are lights on-off with lights selector (side-dipped-main), wipers with washers, and heater with air distribution and fan.
M. Jones, R. H. Gaylord and J. D. Folley of the American Institute for Research. > m ε "O ■g. -22(ο·875)[ i i i i i i i i i i i i i i i i i i i i i i i i i i | 11 i i i i i i i i i i i i i i i i i l i i i 11 i l I I I 1 1 1 1 I I ! 9ht. - IK0425) Round selector knob j ypg r. a-6(0 250) M Height°ΙΟ(θ·375) [ M | 1 M I 1 1 1 1 1 I 1 1 I I 1 1 I ! |Q(0-375) | | | | | | | | | | | | | | | | | | | | | | | | | | I I I I Pointer depthminimum 12-5 mm (Vi in) maximum 75 mm (3 in) A maximum torque of 2*5 nm (22 in lb) should not be exceeded.