Northrop P-61 Nose Radar from http://www.srh.noaa.gov/ssd/tstm/images/instrument2.gif ; dead link, now at https://www.weather.gov/iln/ThunderstormProject

The radar is the SCR-720.

Source: The Thunderstorm: Report of the Thunderstorm project (A joint project of four U.S. Government Agencies: Air Force, Navy, National Advisory Committee for Aeronautics, and Weather Bureau). Horace R. Byers (Director) Roscoe R. Braham, Jr., (Senior Analyst), Washington, D.C.: U.S. Government Printing Office, 1949. page 271

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