Human Engineering |
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Page 187
... normal " hearing or not . A person was considered to have " normal " hearing if there was no loss greater than 20 db at any frequency between 512 and 8192. A comparison was then made of the per cent with normal hearing and of the per ...
... normal " hearing or not . A person was considered to have " normal " hearing if there was no loss greater than 20 db at any frequency between 512 and 8192. A comparison was then made of the per cent with normal hearing and of the per ...
Page 346
... Normal area proposed by Squires Maximum ( left ) Normal ( left ) Maximum ( right ) Normal ( right ) 23.5 15.5 3.5 16 47 59 15.5 20 Figure 13-4 . Dimensions in inches of normal and maximum working areas in horizontal plane as proposed by ...
... Normal area proposed by Squires Maximum ( left ) Normal ( left ) Maximum ( right ) Normal ( right ) 23.5 15.5 3.5 16 47 59 15.5 20 Figure 13-4 . Dimensions in inches of normal and maximum working areas in horizontal plane as proposed by ...
Page 375
... normal " pointer condition indicated by a standard location on all the in- struments . In one study , for example , a comparison was made of the times for check reading two panels of dials . In one panel the dial pointers , when at nor ...
... normal " pointer condition indicated by a standard location on all the in- struments . In one study , for example , a comparison was made of the times for check reading two panels of dials . In one panel the dial pointers , when at nor ...
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acceleration accuracy Acoustical activities Adapted Aero Medical Laboratory aircraft angle anoxia arrangement articulation index auditory average brightness cent color control devices cranks decibels dials dimensions direction discrimination displays distance Dry-bulb temperature effect effective temperature equipment errors example exposure fluorescent lamps footcandles footlamberts force frequencies ft-c given hearing loss heat horizontal human engineering humidity illustrates increased indicate individual instruments intensity Journal knob lever light Luckiesh man-machine systems masking measure ment minor scale minutes of arc noise level normal operator optimum panel performance plane pointer positioning movements possible pressure Psychology range ratio reading reference relationship retina scale markers scale units seat sensory shown in Figure shows signals situations sound waves spectrum speech speech interference speed standard stimuli subjects Table target task temperature tests tion tones typically usually variables various vertical visual acuity