Download Applied Ergonomics Handbook. Volume 1 by B. Shackel (Auth.) PDF

By B. Shackel (Auth.)

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Functional groups can be distinguished by differences in size, shape and colour, either of the individual members of the groups or of the groups themselves. An example of design by sequence of operation To use the principle of design by a 'fixed sequence' one preliminary process is essential; it is usually omitted. Before the design is finalised, the complete operating sequence must be analysed and preferably written out in minute detail; no substitute is adequate. 2a is shown a panel lay-out, with the sequence of operation indicated by serial numbers and lines, as built on a prototype.

If a number of controls on an instrument panel have to be the same shape and size, then grouping or differential colouring can provide a useful indication of function. Furthermore, if controls have to be placed where they are not usually seen under normal working conditions (as in the cockpit of an aircraft), it is still possible to provide adequate means of identification by using different shapes which are distinguishable by touch. Where a control has to be operated in relation to the reading of a dial or scale, it should be possible to watch the reading while operating the control.

Colour: In addition to being a means of coding, colour should also be used to differentiate the knobs from the background panel colour. Summary of Appendix When the control knobs for any equipment are to be selected, we should first remind ourselves of the general purpose of controls in the system. The next stage is to analyse the functions required of each control, and decide to which of the four major categories (A, B, C or D above) the control belongs. ). 5b Redesign for Warner and Swasey Co.

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