A test instrument hanging in a universal joint (to compensate the strong wave motion on board a ship), when measuring carbon dioxide.
The first automatic flue gas monitor "ADOS" 1900:
Driven by updraught in the chimney, the unit takes a sample of flue gas 10-times per hour, automatically analyses the sample and records the content of carbon dioxide.
This forms a measure for the most economic use of fuel by the personnel responsible (boilermen). The standard is around 15% carbon dioxide content in the furnace gases.
In 1898, Max Arndt was awarded the “Elliot Cresson” gold medal in recognition of his patent “Econometer” automatic selfacting flue tester). The medal was awarded by the “Franklin Institute of the State of Pennsylvania, USA”.
Triple test instrument (Triplex) for monitoring the CO, H2 and CO2 content of the ambient air. Used in the chemical industry.