Mimimum allowable knob crowding /
prepared by James V. Bradley, Norman E. Stump.
Description
- Language(s)
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English
- Published
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Wright-Patterson Air Force Base, Ohio : Wright Air Development Center, Air Research and Development Command, United States Air Force, 1955.
- Summary
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"Reach time, turning time and inadvertent touching of adjacent controls were measured while a standard setting was made with one of several closely spaced knobs. Variables manipulated were spacing between knobs, knob diameter and knob configuration. Performance improved rapidly with increasing distance between knob edges up to an interperipheral distance of 1 inch, after which it continued to improve but at a much slower rate. For equal amounts of panel space consumed by several closely crowded knobs, 1/2 inch diameter knobs were more nearly error free than were the larger diameter knobs tested. For equal distances between knob edges, however, performance improved with increasing knob diameter. These results apply only to knobs capable of being operated by moderate torque. Gloves apparently had little effect upon speed of knob operation. It was found that the frequency with which a crowding knob is inadvertently touched is strongly affected by the angular position which it occupies with respect to the operated knob but is practically independent of the presence of other crowding knobs at the same distance from the operated knob."--Abstract.
- Note
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Prepared by the Psychology Branch, Aero Medical Laboratory, Wright Air Development Center, under a project identified by Research and Development Task No. 71514 " Control design and arrangement".
- Physical Description
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v, 21 pages :
illustrations ;
28 cm.
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