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Vietnam War M-48 Patton tanks were equipped with mechanical computers for deflection/elevation and range finding. Mechanical meaning that printed numbers on sheet metal revolved thru window openings, such as odometers on cars used to be made up until the late 1990's when digital odometers began to replace them. Metal GEARS moved the parts prior to the advent of today's computer cells/electronics. The tank's range finder was simply two optical blisters (camera openings) one on each side of the turret, and the TC (Tank Commander-a Sergeant) would physically hand crank (rotate) a wheel as he looked thru the range finder's periscope...when the target's "double" image became one image...he looked up at the number scale in the window of his range finder and saw the number...2400 yards; target was 2400 yards. He physically hand cranked the mechanical computer for deflection & elevation of 2400 into his mechanical computer and the 90mm gun's breech would automatically elevate or depress...adjusting itself for the 2400 yards. Today's M-1 Abram's tank is all digital and computerized. Lasers do the range finding; pushing buttons do all the work. Today's tank can fire accurately while moving, and they can remain on target (the gun can still point at the target while the tank is moving) even when the tank itself is turning in a circle...the turret will rotate remaining on target. In Vietnam, tanks had to stop to fire accurately; and manually rotate the turrent (with power or hand cranked) to keep the cannon aimed at the target.
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