Data Logger and replay unit purchased from Temple Electronics in the 1970s. Used at the Burden Neurological Institute and Frenchay Hospital. The logger records up to 8 channels of digital data on standard cassette tape, and the replayer plays it back, so EEG readings or other signals like intra-cranial pressure could be saved on tape and printed and reviewed after surgery. Data Logger and replay unit purchased from Temple Electronics in the 1970s 1970-1979