Keywords: blackandwhite monochrome indoor black and white A researcher looks through a magnifying glass at one of the tiny models used for sonic boom tests in the 4-Foot Supersonic Pressure Tunnel. These precisely crafted models were between 1/4- and 1-inch long. Image #: 1961-L-1872 Date: A researcher looks through a magnifying glass at one of the tiny models used for sonic boom tests in the 4-Foot Supersonic Pressure Tunnel. These precisely crafted models were between 1/4- and 1-inch long. Image #: 1961-L-1872 Date: |