## 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 year1924 - 475, 868, 869, 8701925 - 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.