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WWII German Rangefinders
Before radar and other means, these stereoscope and coincidence rangefinders were part of the fire control systems for artillery.
Sizes on display are 1 meter, 2 meter, 3 meter and 5 meter.
The 1 meter was typically hand held and used for mortars and smaller cannons. The 5 meter was typically coastal or ship mounted.
The underlying principal is triangulation to calculate distance or height.
Interestingly, the museum's rangefinders on display were still in use until the 1960's
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