Question
For the following visual displays, what is the farthest distance away the worker can be and still be read the display accurately? Snellen acuity of
- For the following visual displays, what is the farthest distance away the worker can be and still be read the display accurately? Snellen acuity of worker = 20/30.
a) Display type: Horizontal fixed scale with moving pointer (15 points)
Length of area available to fit this display (L) = 7 cm
Width of area available to fit this display (W) = 3.5 cm
Scale range = 0 500 units
Numbered interval = 20 units
Graduation interval = 5 units
b) Display type: Circular fixed scale with moving pointer (15 points)
L= 6 cm
W= 6 cm
Scale range = 0 100 units
Numbered interval = 10 units
Graduation interval = 1 units
c) Display type: Semi-circular fixed scale with moving pointer (15 points)
L= 8 cm
W= 4 cm
Scale range = 0 1000 units
Numbered interval = 200 units
Graduation interval = 20 units
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Database Reliability Engineering Designing And Operating Resilient Database Systems
Authors: Laine Campbell, Charity Majors
1st Edition
978-1491925942
