US Department of State's Bureau of Diplomatic Security Countermeasures Directorate [1] has recently launched a new public exhibition on cold-war era eavesdropping gadgets entitled, "Listening In: Electronic Eavesdropping in the Cold War Era." Scientific American posted a slide show ("Spying on the spies") [2] of the exhibition and much of the text written about the devices, from old-school keyloggers to phone tap detectors. The permanent exhibit is located in the lobby of a State Department building in Rosslyn, Va.

Perhaps one of our DC readers can help us out and confirm the location. According to the State Department's list of field offices [3], there are 2 buildings in Rosslyn within a few blocks of each other: 1400 Wilson Boulevard [4] and 1801 North Lynn Street [5].

MASON A3B RECEIVER: U.S. State Department engineers working for the Bureau of Diplomatic Security needed a receiver in order to find devices subversively transmitting signals to the enemy. The best kind of receiver was one that could be moved from room to room without looking like a radio, and the Mason A3 more than fit the bill.