. Basic methods for the calibration of sonar equipment. -r—INNER \[] CONDUCTOR CO DUAL COAXIAL CABLE WITH TWO QUADS RUBBER COVERED COAXIAL CABLE. RUBBER COVERED TWISTED PAIR COTTON COVERED COAXIAL CABLE. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Office of Scientific Research and Development. National Defense Research Committee. Washington, D. C.

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Keywords: ., bookcentury1900, bookcollectionbiodiv, bookpublisherwashingtondc