USS BARRY (DDG 52) October 2016
Did you mean instead to ask about only the conical version?
: When did the navies stop using rat guards?
: Those were the sheet metal cones around all
: lines to the shore to keep rodents from
: getting aboard. They were installed to
: "Funnel the rats toward the ship."
: and the ones on phone lines were joking
: called "mouse guards". The
: question isn't important; it's just change
: that hasn't been remarked upon.