Standard gas flow meter, spirometer, manufactured by Alex Wright & Co. Ltd, used in oxygen laboratory of Mech. Eng. and Eng. Physics Depts. RAE. Claimed to be 'similar' to a device depicted in testing hydrogen purity an Balloon Factory 1890.
Standard gas flow meter, spirometer, manufactured by Alex Wright & Co. Ltd, used in oxygen laboratory of Mech. Eng. and Eng. Physics Depts. RAE. Claimed to be 'similar' to a device depicted in testing hydrogen purity an Balloon Factory 1890.