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Agree completely that the heart of what you’re saying still does comport with the same rationale for the “3 and 6” minute rules (or as the Naval Air instructor in the article above called it, “the other ‘rule of 60’” - basically, trading heavily in units that are relatively easy to manipulate...

I think I’ve come to understand that historical DR perhaps differs from the modern concept of DR, and that the historical sense may be more relevant to these 3 and 6 minute increments. I’ve uncovered the following “sage” advice article from an author who appears to know his stuff; he’s...

Yes; there are various terms, all correct, for these registers that display the chronograph functions. To make a cartoon simplistic dichotomy, a “stopwatch” does not tell time and run continuously, but instead is started and stopped to record the duration of an event; whereas a chronograph is...

Yes, many chronographs of the time stuck with conventional approaches to the minute totalizer; namely, an either 30 or 45 min max, and typically highlighting 5 minute increments. However, the Speedmaster in particular was designed for and primarily marketed to automobile sports; that it was...

Thanks for the response! It’s hard for me to strike the right balance between brevity and clarity. For further clarity, as I understand it, the “3 and 6 minute rules” are are “rules of thumb” intended to achieve quick, shorthand, calculations. As such, they ignore for present purposes the...

This is something like my working hypothesis. But, since I’m not a pilot, much less bit a pilot familiar with early- and mid-20th century pilots that would find a wrist chronograph useful, I’m hoping to find some better authority for this hypothesis. Specifically, one thing I keep running...

Hello forum, I am an interloper to the topics of early aviation, coming instead to the forum as a collector of early pilot’s chronograph watches. I’ve come seeking your expertise, specifically about some “mystery” design features of early pilot’s chronographs. THE “STANDARD” CHRONOGRAPH: A...