brontometer

plural brontometers

1. datedAn instrument for noting or recording the phenomena that accompany a thunderstorm.

   1 more example

   The fans make one revolution for each metre of wind that passes, and send an electric current to the brontometer, where it acts on an electro-magnet, and tends to draw this (2nd) pen towards the left; but a train of clockwork is constantly tending to draw the pen to the right, the joint result being that the pen continuously shows, not the total motion (as is the case with most anemometers), but the actual velocity almost second by second.

   1890 May 8, The Meteorological Magazine, page 195