A dual-purpose computer according to the invention has a gravity-actuated switch mounted therein or thereon. The gravity-actuated switch is used to control the speed of a cooling fan for the computer. When the computer is operated in a horizontal orientation such as a typical rack-mounted server would...http://www.google.co.uk/patents/US6809925?utm_source=gb-gplus-sharePatent US6809925 - Dual-purpose computer having gravity-actuated fan speed control
