Originally Posted by Ole
According to my research, the A.T. Thompson Company was a Magic Lantern supplier here in Boston around the turn of the last century. All of the lens marked that way that I have seen have been large. Since I believe my own was once used in a college lecture hall at Harvard, I think the company may have specialized in machines. I'm happy hear that Jim believes them to be made by Darlot. Mine has only a mark on the flange saying "Made in France", nothing like a maker's mark. I've put mine on a Studio 7A - smallest thing that I could get to hold it. Have fun!