torsiograph

English

Etymology

torsion +‎ -graph

Noun

torsiograph (plural torsiographs)

1. An instrument for measuring the torsion of the crankshaft of an engine.
   • 1945, The Development of Improved Means for Evaluating Effects of Torsional Vibration on Internal Combustion Engine Installations, Society of Automotive Engineers, page 14:

     Mechanical seismic-type torsiographs which record on a continuous strip chart are generally limited to belt drive. This is due to difficulty in mounting the instrument drive shaft in proper axial alignment with the end of the shaft system under test.

   • 1970, Shipbuilding and Marine Engineering International, page 330:

     In 1912 he originated the Geiger mechanical seismic torsiograph which was the first instrument to record torsional vibrations of shaft systems as a continuous wave-trace on a paper ribbon […]

   • 1997, John J. McKetta Jr, Encyclopedia of Chemical Processing and Design‎^[1], volume 59:

     In appropriate installations, the torsiograph provides good evidence of most torsional vibration modes.