Chr. Ward C9 harrison jumping hour mk I, Руководство пользователя

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The numerals for the hours are carried on a revolving
disc. When 7.59, for example, changes to 8.00 as the
minute hand reaches the end of the 59th minute,
the 8 “jumps” into the window to succeed the 7.
Many Jumping Hour watches do not keep especially
good time as the surge of extra power the watch needs
for the hour to change puts stress on the movement.
Johannes Jahnke’s ingenious solution has been
to create a movement that ensures the watch
uses a consistent amount of power throughout
the course of an entire hour, resulting in
much greater accuracy and reliability.
“Johannes’ solution spreads the load over the hour
interval with the result that the change or ‘jump’
is extremely precise and accurate.”