Apple PowerBook G3 - Manual (Page 87)

Health, Safety, and Maintenance Tips 87
Arranging Your Work Area and Equipment
The suggestions in this section can help you work more comfortably with you computer.
Chair
m An adjustable chair that provides firm, comfortable support is best. Adjust the height of
the chair so your thighs are horizontal and your feet flat on the floor.
The back of the chair should support your lower back (lumbar region). Follow the
manufacturer’s instructions for adjusting the backrest to fit your body properly.
Keyboard and Trackpad
m When you use the keyboard and trackpad, your shoulders should be relaxed. Your upper
arm and forearm should form an approximate right angle, with your wrist and hand in
roughly a straight line.
m You may have to raise your chair so your forearms and hands are at the proper angle to
the keyboard. If this makes it impossible to rest your feet flat on the floor, you can use a
footrest with adjustable height and tilt to make up for any gap between the floor and your
feet. Or you may lower the desktop to eliminate the need for a footrest. Another option is
to use a desk with a keyboard tray that’s lower than the regular work surface.
m Use a light touch when typing or using the trackpad and keep your hands and fingers
relaxed. Avoid rolling your thumbs under your palms.
Some computer users may develop discomfort in their hands, wrists, or arms after intensive
work without breaks. If you begin to develop chronic pain or discomfort in your hands,
wrists, or arms, consult a qualified health specialist.
m Change hand positions often to avoid fatigue.
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