Farrand Y-7 Bombsight

This is another massive optical bombsight made by Farrand. Figure 1 shows the whole 80 pound beast compared to a soda can.

The only reference I can find to it is from the Air Force Systems Command, Historical Publication Series, Development of Airborne Armament, 1910-1961:

The vertical periscopes did not remain immune to the continuing drive for improvement. First, Farrand altered the Y-3 vertical periscope to utilize a shallower optical dome; the revision was designated Y-5, and scheduled for installation in the B-52, Next, the Armament Laboratory published a design exhibit for a 50-inch-long vertical periscope, designated the Y-7, which incorporated the shallow dome of the Y-5. Both Farrand and Eastman Kodak were to manufacture the Y-7. This was the "ultimate" vertical periscope for the "K-Series" system, and was intended for installations in the B-52, the B-36, and the "large nose" B-45. In January 1952 Farrand contracted to design and construct two prototype Y-7's. One month earlier, Farrand had delivered the first model of the Y-5 vertical scope to Boeing's Seattle plant for installation in the XB-52 aircraft.52