HARP

Actual stick figures (wooden sticks) were built by B&F from their laboriously hand calculated data. They also made advanced maps (including hysteresis curves) and calculations, plus measurements taken from cadavers of centers of mass of each body part.

Later, widely used, others used strobe lighting which made the capture of sequence easier but required other calculation gymnastics to get at measured data.

Well, not exactly rocket science?

But it was! ==>

[Using high speed film] Dr. Sutherland worked with NASA

engineers trying to catch up to Sputnik using the Vanguard (above) film exam device. It sported 2 wheels like an Etch-a-Sketch that mechanically drove, X & Y built-in cross hairs (2 wires). The x & y were pencil logged. Unknowingly the engineers redid what Braun & Fischer had done so long before – math wise - but without the big worn flashing contraption (making clinical use impossible). Dr Sutherland, in California, worked with these measurements from film taken of kids with cerebral palsy (and other stuff ). Now we had ball park measurements of expectation for commonly seen pathology. Now it really begins. Scientific speculation and proposing with numeric tags that can support or refute hypotheses (hypotheses without relevant measurement is called WAG). Sometimes WAG works, but you don’t know for sure. Measurement was possible –