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Heron of Alexandria: An inventor and mathematician from the 1st century AD, often called the "greatest experimenter of antiquity."
Artillery Construction: (Belopoiika) A manual detailing the mathematics and mechanics of "torsion" engines—catapults that used twisted hair or sinew for power.
Royal Prussian Academy of Sciences: The premier academic institution in Prussia, which published high-level research in history and science.
Hermann Diels: (1848–1922) A giant of German classical philology.
Erwin Schramm: (1856–1935) A pioneer in the field of experimental archaeology regarding ancient military machines.