metrograph

noun4

1. •
   An instrument attached to a locomotive for recording its speed and the number and duration of its stops.

   • Metrographs have been devised for counting the revolutions and speed of locomotive wheels. — 1880
2. •
   A device used to measure the flow and velocity of liquids.

   • Represented by R.W. Sparling, and C. F. Sherwood, exhibited the Sparling line of main line meters and metrograph recording instruments. — 1929
3. •
   Any of various devices that continuously record several meteorological phenomena; a radiosonde or one of its precursors.

   • The automatic records of the sunshine recorder, the anemometer and the wind vane, are registered on one instrument, which is called a metrograph or improved triple register. — 1895
4. •
   A device that uses reflection holograms to accurately measure three-dimensional objects, used primarily in orthodontics.

   • With the metrograph, the hologram is fixed and the point of light can be moved in the three orthogonal directions. — 1986