Chronometrie

Henri Wehrli
473 - 1925 series A 759 points 2nd prize
868 - 1926 series A 772 points 2nd prize
4903 - 1928 series A 752 points 2nd prize
??? - 1928 series A 699 points 3rd prize
??? - 1929 750 points 2nd prize series B

 

 

 

Niton results at the Observatory by year

1924 - 475, 868, 869, 870
1925 - 473, [Niton received a Mention honorable for average 673.6 points]
1926 - 474, 868, 869
1927 - 4908
1928 - 4903, ??? [699]
1929 - ??? [750 points]

 

 

 

Results by points

772 - 868
759 - 473
752 - 4903 [1928] 750 - ??? [1929]
732 - 474
699 - ??? [1928], 4908
684 - 475
683 - 869
629 - 870
613 - 868

 

Calculations

Daily mean deviation=m
Mean deviation by position=p
Error compensation=c
Rate resumption=r


Old formula before 1909:
(0.75-m) * 400 / 3 + (2.5-p) * 40 + (0.20-c) * 350 + (5.0-r) * 6
Maximum 300 points

New formula after 1909:
(0.50-m) * 600 + (2.0-p) * 150 + (0.150-c) * 2000 + (2.5-r) * 40
Maximum 1000 points

Watches which successfully passed the tests were issued a Bulletin de Marche, certifying the results obtained. Watches which scored more than 2/3 of the available points were published by the Société des Arts until 1927, then by the Publications de l'Observatoire de Genève until 1968.