United States. National Advisory Committee for Aeronautics, United States. National Aeronautics and Space Administration · Washington : G.P.O. · leaf 512
^ 12 per cent for the same power and the variation in speed was ± 6 per cent … FIG. 1. -RECORDING AIR SPEED METER.
Aeronautics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
