axially extending chamber in the rotor a vertically upwardly oriented stationarily supported stub shaft projecting into the rotor chamber and axial as well as radial gas bearings disposed within the rotor chamber for generating gas cushions between the rotor and the stub shaft application_number US 52697974 A description turning now to the figures in general there is shown a stator housing 1 to which there are affixed radially inwardly extending stator vanes 2 and a rotor 3 to which there are attached radially outwardly extending rotor vanes 4 the rotor 3 is hollow that is it has a downwardly open axially extending cylindrical chamber which gives the rotor 3 a bell shaped configuration into the rotor chamber there projects a stub shaft 5 which is fixedly mounted at its foot portion in a manner not shown in detail to a base plate 6 also serving to support the stator housing 1 the stub shaft 5 contains ports for the admission and withdrawal of gas required for the gas bearings that support the rotor 3 thus for this purpose as shown in fig1 in the stub shaft 5 there are provided two longitudinal gas intake channels 7 and 8 and further a central gas outlet channel 9 which all pass through the base plate 6 from the gas channels 7 and 8 there extend channels 10 11 12 and 13 which terminate in radially outwardly oriented nozzles 14 15 16 and 17 respectively at its upper end the stub shaft 5 has a collar like enlargement 18 in the zone of which there extend two further channels 19 and 20 from the gas supply channels 7 and 8 respectively the channels 19 and 20 terminate in respective vertical bores 21 and 22 which are disposed in the collar like enlargement 18.