Sword of Damocles

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The Sword of Damocles is a positional tracker made as a part of Ivan Sutherland's head mounted display system.[1] It is mechanical can be ceiling mounted.

It was a mechanical head position measuring system constituted by an extendable tube with a universal joint at the top.[2]

It was the backup tracker.[1] The primary one was an ultrasonic positioning system.

The HMD system in full is named A Head-Mounted Three-Dimensional Display.

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