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Excerpt from A Course-Shift Indicator for the Double-Modulation Type Radiobeacon
To further increase the reliability of the visual directive radio beacon system. Developed by the Bureau of Standards, an indicating instrument primarily for station use has been developed which serves a twofold purpose to. Indicate to a station operator whether a given course as laid out in space remains unvarying during a given tme of operation, and (2) to serve as a check on the beacon calibration.
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