Belopoeica
Hero of Alexandria
Hero of Alexandria. Greek and Roman Artillery: Technical Treatises. Marsden, Eric William, editor. Oxford: Clarendon Press, 1971
119 ΓΒ· ἔσται ἄρα καὶ ὡς ἡ ΒΑ πρὸς ΑΖ, οὕτως καὶ ἡ ΗΓ πρὸς ΓΒ· τῶν ἄρα ΑΒ, ΒΓ δύο μέσαι ἀνὰ λόγον εἰσὶν αἱ ΑΖ, ΓΗ.
ΗΡΩΝΟΣ ΚΤΗΣΙΒΙΟΥ ΒΕΛΟΠΟΙΙΚΑ