An instrument designed to record or measure the characteristics of thunder, such as its intensity and timing during storms.
From Greek 'bronte' (thunder) + '-graph' (instrument that writes/records). This scientific instrument name follows the 19th-century pattern of creating specialized measurement devices.
The brontograph is a forgotten ancestor of modern seismographs and sound recorders—scientists were so fascinated by thunder they invented machines just to study its every rumble and crack.
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