I just remembered that the cameras we were assigned were not Rolliflexes, which were top of the line cameras from the 20's on, but Yashica D's. But they were twin lenses like the Rolliflexes and yes, same a you, you had to look down into the ground glass viewfinder. And they were that same 2 1/4 square format also. It took a little getting used to taking pictures of race boats because the bow of the boat faced left as I panned to the right while focusing. Through the viewfinder, the boat was aiming the opposite direction from where it really was going. The film had a paper backing which had to be removed prior to loading on the reel for processing. Peeling the tape from the film which held the paper in place would cause a fluorescent static discharge if you pulled too fast. The roll of film held 12 frames. That picture you linked to is a great one. What I would do to make it even better is crop out everything else except the boats. It would really be a crowded looking shot in a race.