The IBM 7094 computer in the Columbia University Computer Center machine room some time between 1964 and 1968, operator John Szallasi at the console. The IBM 709x series are the 36-bit machines on which LISP was developed; its 18-bit halfwords were perfect for CARs and CDRs. This is the machine that inspired DEC's first 36-bit machine, the PDP-6, which was followed by the PDP-10 and DEC-20.
Photo: Clipped from the CUCCA 20th Anniversary Collage.
Here are some other, non-Columbia IBM 7094 images:
An IBM Photo Archive shot of a large 7094 system.
Above: Views of the IBM 7094 at MIT about 1962 (found on the Web). This machine is running MIT's Compatible Time Sharing System (CTSS), arguably the first timesharing system, which was later countered by MIT's PDP-10 based Incompatible Timesharing System (ITS).
Above: An IBM 7094 console (collection of Paul Pierce).