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Irwin’s planograph

Published 15.01.2012 Presenter Anton Pankratov

Irwin’s planograph
Most measuring devices at the end of the 19th in the beginning of the 20th centuries were characterized with digital data display with a dial needle.
But experiments with light rotating mirrors led to invention of devices having data output as graphics drawn with light ray.
Planograph built by an English engineer John Thomas Irwin belonged to another ...