A multi-channel digital event-recorder for field applications
M J Goodspeed, J V Savage · Journal of Physics E Scientific Instruments · 1969
The instrument described is intended primarily for the long-term unattended recording of hydrometeorological data on a medium suitable for immediate input to a digital computer. It records the occurrence of `events', in relation to time, on computer-compatible punched tape. These events may be, for example, the registration of 0·01 in rainfall or a rise of 0·01 ft in stream level. Examples of the transducers necessary to provide the required incremental inputs to the recorder are briefly described.