Instrument for measuring speed. In watchmaking, a timer or chronograph with a graduated dial on which speed can be read off in kilometers per hour or some other unit (see timer).
Instruments used for registering intervals of time (duration, brief times), without any indication of the time of a day.
Device invented to eliminate errors of rate in the vertical possitions. It consists of a mobile carriage or cage carrying all the parts of the escapement, with the balance in the center. The escape pinion turns about the fixed fourth wheel. The case makes one revolution per minute, thus annulling errors of rate in the vertical position.
