National Geographic : 1964 May
The Accutron Story Old-fashioned balance Accutron tuning fork wheel is still used in all keeps virtually perfect time wind, self-wind, and electric and comes with the watches.It is not used first guarantee of accuracy in the Accutron movement. ever given. We don't call it a watch. This principle not only accounts for the time the All the parts that make a watch fast or slow have Accutron movement will keep. It also frees this been left out. (The Accutron movement doesn't timepiece from all the mechanical changes that even tick. It hums. Hold it to your ear. It's eerie.) occur to a regular watch. But let's answer the big question first. What kind One speck of dust or congealed watch oil, for of time does it keep? instance, can throw your present watch off as Here are 2 statements that no regular watch has much as several minutes a day. So can a worn ever dared make: balance wheel, staff, screw or spring. 1. We guarantee average daily accuracy within These things do not affect Accutron time at all. 2 seconds.* (In fact, 1 second or none at all are more In fact, this timepiece only has 12 moving parts common!) -and the only thing you ever have 2. And what's more, this is the accuracy this to replace is the battery. (And the timepiece will keep for life. battery lasts at least a year.) You can see why the United States now uses the In short, you can forget about Accutron movement instead of conventional tim- the usual cleaning bills and the cost ing devices in satellites. of new parts-just as you (And why the Air Force issues it to all X-15 can forget checking your time to m pilots. Many owners use it for celestial navigation.) see if it's right. 0 The secret lies in the vibrations of a fine tuning (Owners have even told us fork. 360 of them a second. ,they find it a little strange, being : (A regular watch only splits a second into 5 parts.) this sure of anything these days.) L'412 " model shoend$135 plus .ae Othsermodelstfrao$125 plustax 'C or Aceutronjewelarwill adjusttime i this tolerance,it necessaryGuaran i,. teai ton e tall year. $1 1564, BalovaWatchCompasy,Inc.