An apparatus for production of gas mixtures of controlled composition

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Abstract
The paper describes a device for delivering a gas mixture whose composition can be varied rapidly and accurately in a series of discrete steps by means of appropriate electrical signals. The apparatus consists of a mixing chamber, a stationary gas inlet, 10 movable gas delivery tubes connected to a reservoir, and electromechanical apparatus for moving the tubes. It is illustrated. Air is delivered to the mixing chamber through the stationary gas inlet and a mixture of CO2 (21%) and CO2 (79%) is delivered to the chamber through the movable delivery tubes. The concentration of CO2 in the effluent from the mixing chamber is a function of the number of movable tubes whose effluents enter the chamber. If the rates of flow through all movable tubes are equal, this relationship will be linear. The apparatus was designed on a scale suitable for changing the concentration of CO2 delivered to a pigeon or other small animal. The principles involved in constructing this apparatus can readily be applied to a similar device for larger animals.

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