Black and white. Harvard University Mark I Relay Multiplier. Consists of four large racks. The left most rack has an oscilliscope . The next rack has a series of indicator lights then four banks of knobs the top two labeled MC and the bottom ones MP. Also a series of toggles and push button switches and some plug wires. After this several rows of relay cans. The last two racks have no external components. Verso: MK I Relay Mult. W. Seman / J. Roche 1952. Also in red Fig I I-32
