HSCS: How can I join?
Bubblyrat: As I understand it, the dipping lug has its tack attached before the mast, and the standing lug has the tack attached to the mast. My Admiralty Manual of Seamanship (date missing, but 1940s I think) describes the Montague rig as having a standing lug, even though, as you say, the yard was dipped on tacking. The whaler rig certainly changed over time. The 1915 MofS shows the whaler with 2 dipping lug sails as an alternative to the Montague rig. Teribus says above that the 3-in-1 had a cutter rig, so that was, presumably de Horsey.