urn:nasa:pds:context:instrument:qmu-wal.butterfield_wt 1.3 1.25.0.0 Product_Context 2026-07-07 1.3 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.2 Updated schema version. Adding missing "facility" references. Updated CTLI instrument types. 2025-01-02 1.1 Updated schema version. Adding missing "facility" references. 2019-02-20 1.0 Initial creation of the context product. urn:nasa:pds:context:facility:laboratory.qmu-wal instrument_to_facility 10.1002/esp.3290150307 Williams, J.J., G.R. Butterfield, and D.G. Clark, (1990), Aerodynamic entrainment thresholds and dislodgement rates on impervious and permeable beds, Earth Surface Processes and Landforms, 15, 255-264. Butterfield Wind Tunnel, Whitehead Aeronautical Laboratory, Queen Mary University of London, UK Wind Tunnel The Butterfield Wind Tunnel is an open circulation, suction-style wind tunnel with length of 3 m and cross-sectional area of 0.16 by 0.16 m. Graeme Butterfield was associated with the Department of Geography and with Aerospace Engineering at Queen Mary and Westfield College, University of London, merged in 1989 to be Queen Mary University of London, UK.