I worked on one in another century, Rakassa, 75 feet, built by Camper & Nicholsons.
Her rig was similar to that in the photo posted by DDW but without the wishbone, so the mainsail, as they called it, was not perhaps as efficient as it might be. I was always a little nervous when we flew the main because of all that mainsheet load at the head of the mizzen . . that mast needed some pretty robust support.
On the plus side, she could sail under her lowers in practically a full gale . . .