A vintage two-pen chart recorder of the type used widely in the scientific and industrial community starting at the end of the 19th century. The Bristol Manufacturing Company was established in 1889 and produced a wide variety of circular and linear recorders for accurate measurement of temperature, flow rates, humidity, pressure etc. This model, which measures 48 cm wide by 39 cm high by 38 cm deep and is believed to have been manufactured in the 1950s, uses rolls of paper with a 28 cm wide recoding area. Each of the two pens records a signal in the 0-50 mV range. It is unknown where specifically at CRNL this unit was installed and used.
