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Paper describes totally enclosed blowers with gas-lubricated bearings as developed by British Brown Boveri Ltd; main principles of gas lubrication and properties of different types of gas bearings are briefly discussed; paper deals mainly with design of gas-bearing blowers, especially in relation to primary cooling gas circulators as supplied for "Dragon Reactor Experiment"; operating record of these circulators which have been in operation since Aug 1964 is briefly reported and shows that gas-bearing blowers are reliable and suitable for long continuous service.