Lyle rescue gun, a line thrower used for shore-based rescue operations. Designed in the late 19th century and used until 1952.
https://diqn32j8nouaz.cloudfront.net...rescue_gun.jpg
Previously:
https://www.homemadetools.net/forum/...573#post139468
https://www.homemadetools.net/forum/...047#post112273
https://www.homemadetools.net/forum/...789#post133250
