By B. Shackel (Auth.)
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References Jenkins, W. H. and Connor, M. B. 1949 Journal of Applied Psychology, 33. 395-409, Some design factors in making settings on a linear scale. Jones, E. , Gaylord, R. H. and Folley, J. D. 'Guide to human engineering of miniaturised equipment', Report Air-261-59-FR202 by American Institute for Research, Pittsburgh 32, Pa, USA, for US Army Signal Supply Agency. Chapter 5 Layout of panels and machines Important features in the positioning of individual controls and displays are introduced in this chapter.
The resulting contour map of the three-dimensional reachable work space shows very clearly that the length of reach depends on direction of reach. The two-dimensional character of drawing board layouts and profile diagrams of body and reach make it easy to overlook this point. 7 The acceptable limits of reaching are influenced not only by body size and the forces that have to be exerted but also by frequency of the action concerned. For instance, heavy objects should be stored within a narrow range of heights close to the waist whereas light objects may be stored at any height between knee and shoulder.
12. 12 A useful way of checking workspace requirements. Each spot on the chart denotes a reaching or seeing requirement that will affect the layout of the work space. Applied Ergonomics Handbook 49 between every pair of items listed. These are indicated by spots on the chart. A check list (Table 1) can be used to obtain a description of each of the operator requirements. The need to allow space for trainees, visitors, supervisors and assistants, may also be important. In such cases as computer consoles, drafting units and medical apparatus it may be necessary to enable other people to see what is going on without getting between the operator and his task and without having to adopt awkward postures in order to see round him.