Jeff, thanks for an interesting series of posts

Jeff Morris wrote:
..... the rule survived the 1948 re-write,
since clearly the days of windjammers was over by then. However, many
of the mariners then did have square rigged experience - My
father-in-law, who was in the Merchant Marine in WWII served under a
captain who had round Cape Horn a number of times in square rigged ships.