For many years the front gates were regularly locked. This is the first I’ve ever seen of this sign, though. It think the picture was taken in about 1917:
Just for a refresher, here’s what was on the other side of the gate in this era:
I wonder if they wanted them latched so they wouldn’t swing around, because it doesn’t seem like it would provide much in the way of security.
Bonus: I’m in New York for a meeting. It’s been very foggy. Pretty cool looking.