. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. DIRECT-COUPLED PRE-AMPLIFIERS Set circulating current to 1mA •750il Unit dry A± cell -r_ Push button c^ 100 il 100 i^ 100 fi, 100 ii 100 il 100^ 100 a 100 ft 100 fl. Hundreds of millivolts selector switch Figure Tens of millivolts selector switch + -o Calibrator output Q 25-0-25 llA meter Checkir Weston button standard cell / _:^ iVzv '- Leclanche cell 3-3 k 100^2 Polarity reversing switch S ^ 100 u p,A —WVy^/ Set circulating current lOQ. Please note that these images are extr

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. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. DIRECT-COUPLED PRE-AMPLIFIERS Set circulating current to 1mA •750il Unit dry A± cell -r_ Push button c^ 100 il 100 i^ 100 fi, 100 ii 100 il 100^ 100 a 100 ft 100 fl. Hundreds of millivolts selector switch Figure Tens of millivolts selector switch + -o Calibrator output Q 25-0-25 llA meter Checkir Weston button standard cell / _:^ iVzv '- Leclanche cell 3-3 k 100^2 Polarity reversing switch S ^ 100 u p,A —WVy^/ Set circulating current lOQ. 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 Donaldson, Peter Eden Kirwan. New York, Academic Press

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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity