harpoon cannon
harpoon cannon is a cannon or weapon type.
Overview
Whaling implement.
In detail
Its recorded use is whaling.
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
“Harpoon cannon”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q18348505: harpoon cannon
Consult the source