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The Accutron "Spaceview D"

The Accutron uses a tuning fork for an oscillator.

Fork Bulova Watch Co. introduced the Accutron in 1960. It uses a tuning fork as the vibrating unit instead of a hairspring and balance wheel. Power supplied from a battery causes the tuning fork to vibrate at 360 cycles per second. Gears convert the vibrating motion of the tuning fork to rotary motion to turn the hands on the analog dial. And Bulova ads pointed out watch buyers could actually hear the sounds of innovation: the Accutron doesn't hums.

Hetzel The original designer for the Accutron was Max Hetzel, who worked for Bulova in Bienne, Switzerland, and constructed a prototype in 1955. When Bulova's New York office took up the idea, chief engineer William Bennett, Egbert Van Haaften and William Mutter worked for four years to produce a commercially viable product.

The Accutron was the most accurate wristwatch available before the quartz revolution.

Accutron Bulova claimed the Accutron to be accurate to within one minute per month, to only a few seconds per day. Accutron timepieces were used in early U.S. space satellites as signal cut-off timers. Arctic explorer, David Humphreys, was able to use the Accutron along with a sextant to calculate that Greenland is 3,000 square miles larger than previously thought.

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