'Brontograph' definitions:

Definition of 'Brontograph'

From: GCIDE

Brontograph \Bron"to*graph\, n. [Gr. ? thunder + -graph.] (Meteor.) (a) A tracing or chart showing the phenomena attendant on thunderstorms. (b) An instrument for making such tracings, as a recording brontometer. [Webster 1913 Suppl.] Brontolite