thunder sheet
thunder sheet is an idiophone or type of musical instrument.
Also recorded as thunder machine.
Overview
Percussion instrument.
In detail
thunder sheet is an idiophone or type of musical instrument.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Thunder sheet”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1241859: thunder sheet
Consult the source