HP 900 Reference Manual page 38

Operating the OmniBook
Working in Comfort
A curved seat edge. The front of the seat should be curved and finished in a
"waterfall" edge.
An adjustable back support in both height and forward and backward tilt. It is
important that the backrest correctly supports the lower part, or lumbar curve, of the
back.
A freely rotating swivel so you can move easily from side-to-side.
Fully adjustable and padded armrests. The chair arms should not interfere with
adjusting the chair or moving it close to your work surface.
Your Work Surface
Ideally, you should be able to adjust the height of your work surface.
A simple way to ensure your work surface is at the correct height is to first adjust the
height of the seat-pan of your chair. With your chair properly adjusted and your feet
firmly on the floor, adjust the work surface height until your forearms are parallel to the
floor when you have your fingers on the keyboard or other input device.
Your Work Posture
Sitting in one position for long periods can be uncomfortable. To minimize the potential
for physical discomfort or injury, it's important that you maintain proper posture.
Back: While sitting at your work surface, make sure your back is supported by the
chair's backrest in an erect position or angled slightly backwards.
Arms: Your arms should be relaxed and loose, elbows close to your sides, with
forearms and hands approximately parallel to the floor.
38 Reference Guide