. Electric wave staff : Hydrographic Office model mark I. Oceanographic instruments; Waves. GRADUATED RESISTANCES TO TRANSFORMER RECTIFIER AND RECORDER. CONTACT POINTS THREADED NIPPLE Hi'h STEP-RESISTANCE GAGE SECTION FIG. 2. 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 Upham, Sidney H; United States. Hydrographic Office. Washington, D. C. : U. S. Navy Hydrographic Office

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Keywords: ., bookauthorunitedstateshydrogr, bookcentury1900, booksubjectwaves