By the way folks, if you want to see (and print out) the patent for the Panoram mechanism which has some real nice drawings of all the parts, just go to http://patft.uspto.gov On the left side of the opening page there is a link that says "View Patent Full-Page Images" -- click on it and it will take you another page that has a box filled with 8 zeros at upper left and a button labeled "View Patent".
Position your cursor at the right side of the box and Backspace to remove 6 of the zeros, then type in the patent number, 693583. There should be 2 zeros to the left of the number just typed (else it will not find the patent) . . . if the patent number is correct & with the two leading zeros, then click the VIEW PATENT button and it will come up. Then you can print out the patent (6 pages) if you wish.