When I was in Switzerland last week, Jack Heuer, great-grandson of Edouard Heuer, chatted to me about the history of the Mikrograph watch that times to 1/100th second
Back view of TAG Heuer's wristwatch version of the Mikrograph that also times to 1/100th second, note the two escapements. One oscillates at 360,000 beat an hour and the other at 28,800 beats an hour.
Edouard Heuer, great grandfather of Jack Heuer who invented the Mikrograph in 1916, capable of timing to 1/100th of a second
The 1916 Mikrograph stopwatch that note only timed to 1/100th second, but also offered easy legibility. Previously, timing had only been possible to 1/5th of a second.