Type T Dynograph portable 8 channel EEG pen recorder manufactured by Offner in 1958 and used at the Burden Neurological Institute. The instrument employs direct coupled amplifiers enabling recording of steady potentials and transients. 8 double ganged 24 way switches enable any two of 24 electrodes to be connected to each of the 8 channels. Electroencephalogram (EEG) pen recorder, Chicago, United States, 1958 1958
