The Orsat was returned to the Historical Collection by Len Taylor, former staff member of SMB. For a period of time it was with Gary Price who rebuilt the Orsat to working order. Gary used a similar apparatus at Sidchrome and Ballarat Heat Treatment Pty. The Orsat apparatus is used to measure volumes of Carbon Dioxide, Oxygen, and Carbon Monoxide within a fixed volume of a sample of gas.Timber box with lift up front revealing a number of valves, pressure measure and glass container of red liquid attached to hose. Gas analysis apparatusorsat, len taylor, gary price, carbon dioxide, oxygen, carbon monoxide, gas, measure, apparatus