. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. ELECTKIC FISH SCREEN 119 voltage oflF the screen until 6 p. m., during which period between 3,000 and 4,000 fish went into the protected area. These fish were coaxed out of the protected area by feeding before the screen was electrified again. This accidental interruption of the screen power supply showed two things: First, it is important to have a reUable source of supply, and, second, the screen was effectively keeping the fish out of the VARUTION OF ELECTRODE SURFACE VOLTAGE GRADIENT
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. ELECTKIC FISH SCREEN 119 voltage oflF the screen until 6 p. m., during which period between 3,000 and 4,000 fish went into the protected area. These fish were coaxed out of the protected area by feeding before the screen was electrified again. This accidental interruption of the screen power supply showed two things: First, it is important to have a reUable source of supply, and, second, the screen was effectively keeping the fish out of the VARUTION OF ELECTRODE SURFACE VOLTAGE GRADIENT WITH SWCING FOR PARALLEU CYLINDRICAL ELECTRODES IMMERSED IN WATER OF ANY UNIFORM RESISTIVITY VOLTAGE ONE VOLT TO NEUTRAL OR TWO VOLTS BETWEEN ELECTRODES VOLTACE eKADIENT AT THE. SURFACE OF ^INCH STANDARn Pipe EICCTEOOC I «â «â â¢> n *⢠â¢Â« S t( *l (« M II II 3 It , r , r I " ft. Fia. 14 protected area. Following this interruption the screen was kept electrified continu- ously for 10 days. During this period sunshine and cloudy and rainy weather were experienced. One very hard rain, lasting about 36 hours, occurred on August 25 and 26. This afforded an opportunity to see whether weather conditions had any influence on the effectiveness of the screen equipment, and as far as could be observed it did. 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 Fish Commission. Washington, The Commission, Govt. Print. Off
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