Keyboard height

• "allow your forearms to be horizontal to the keys ... elbows at a 90-degree angle at a minimum." [http://www.fujitsu.fi/ergoweb/HowTo/workkeyb.htm]
• "operate the keyboard with the home row at approximately elbow height and the hands, wrists and forearms in a straight line approximately parallel to the floor" [http://www.dir.ca.gov/DIR/OS&H/DOSH/dosh_publications/ergonomic.html]
• "Ideal typing posture is for hands to rest on a keyboard with a negative tilt. To achieve a negative tilt, the keyboard tray must tilt forward. This places the front row of keys higher than the back row. Additionally, the keyboard tray must be adjustable vertically so that the keyboard may be positioned just below the operator's elbows [Tessler, 1994]. ... a keyboard tray sold by Ergo Kare (800/927- 5273) that adjusts 7 inches vertically and with an adjustable negative tilt of 25 degrees [Illustration 3]. Fortunately, of the trays we found, this tray also proved to be one of the easiest to adjust. While many trays have 2 or 3 levers for adjustments (thus guaranteeing no one will ever adjust them), this tray has one lever that adjusts the keyboard up or down. It is locked in place by releasing the lever. The entire keyboard tray also slides backwards and forwards. Consequently, when no one is working at that particular station, it can be tucked away [QuickTime 3]. Each of these was about a $125" [http://www.lib.ncsu.edu/stacks/l/libres/libres-v7n01-seaman-designing.txt.txt]