Reference: Engines
Easton
(1.) Heb hishalon i.e., "invention" (as in Ec 7:29) contrivances indicating ingenuity. In 2Ch 26:15 it refers to inventions for the purpose of propelling missiles from the walls of a town, such as stones (the Roman balista) and arrows (the catapulta).
(2.) Heb mechi kobollo, i.e., the beating of that which is in front a battering-ram (Eze 26:9), the use of which was common among the Egyptians and the Assyrians. Such an engine is mentioned in the reign of David (2Sa 20:15).
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Fausets
Military, "invented by cunning men" under Uzziah (2Ch 26:15); propelling missiles, stones, and arrows. The monuments of Egyptian and Assyrian warfare have no representations of such engines. Thus Scripture is confirmed, that the invention was in Judah under Uzziah. Pliny (7:56) assigns it to Syria. Ezekiel (Eze 26:9) alludes to battering rams, mehhi qaballo, "a striking of that which is in front," whether with a battering ram, or balista, or catapult; "he shall set an apparatus for striking against thy walls"; also Eze 21:22; 4:2, karim, translated "captains" in Eze 21:22, where see margin.
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Morish
Machines for discharging missiles. 2Ch 26:15. See ARMS. ENGINES OF WAR were battering rams. Eze 26:9.