. Electronic apparatus for biological research . HT+ be used as an oscillator or as a tuned amplifier has been published by Morton^^. REFERENCES 1 Attree V. H. /. Sci. Inst rum. 26 (1949) 257 ^ Carter J. M. Designing a tape recorder Wireless World 59 (1953) 164 ^ Donaldson P. E. K. A multiple-channel oscilloscope for electrophysiology Electron. Enging. 39 (1957) 78 4 MACLEOD K. C. /. Television Soc. 5 (1949) 201 224

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