. Electronic apparatus for biological research . Figure amplitude of the erase signal can be any size provided it is sufficient to eradicate previous recordings, and where any frequency will do provided it is several times the highest frequency that can be recorded. If the output is taken from the anode it is not difficult to get a peak-to-peak swing of nearly 212

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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity