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ètre à résonance two centuries later françois-paul journe took up the challenge with a ... first creation in the form of a pocket-watch which did not yet ... to his expectations it would take fifteen more years of work for the watchmaker ... present an exclusive world première the first resonance wristwatch he devised ... their movement nonetheless this harmony is possible only if the difference in ... frequency between them does not exceed five seconds per day of cumulated difference ... in six situations adjusting them is an extremely delicate task whereas an ... come back towards each other to find their point of harmony thus eliminating ... offers a level of precision that is unequalled in the field of the ...

the constant-force device from ancient times humankind has constantly ... measure time by dividing it into equal fractions and inventing the notion of isochronism ... only with the arrival of the first mechanical clocks did specialists begin ... to seek a means of equalising the force reaching the escapement the balance- ... did not yet exist and the so-called foliot balance had an irregular beat due to ... the arrival of a force varying because of the imperfections of ... escapement thus ensured a more constant flow and enabled an autonomy of several ... months this was the first remontoire or constant-force device ... hand became widespread and the constant-force device fell into oblivion for around a ...