When I see these old pressure curves, velocity data, etc. I just have to shake my head. I spent my life as an engineer making things, breaking things, measuring things, and testing things. I just have to wonder how they did it? The first electronic chronographs showed up after the 2nd WW. The strain gauge was invented around 1938. High speed data recording came along in the late 1960's. I wonder if there are any text books from the early 1900's that mention such measurements? That could be some interesting reading. I suspect that a lot of the published data was invented in the ad departments.
C.G.B.
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