suitable for the low temperature and high pressure which the blower will be subjected to the inlet means may for example consist of a conduit element 1 which is comprised solely of a coupling element of the swivel joint e g the coupling means of the housing of a swivel joint as described in more detail below the inlet means may if desired also include other elements such as for example solenoid valve and tubing combinations for controlling the flow of the cryogenic fluid e g liquid co 2 any suitable source of liquid co 2 may be connected to the inlet conduit element 1 using any connecting means which will provide fluid communication between the source and the inlet means e g piping flexible pressure hose solenoid valve and tubing combinations etc the blower is also provided with two swivel joints 5 and 6 which serve to couple the elements of the conduit means together so that not only is outlet means as a whole rotatable but the second conduit element is rotatable as well the second conduit element being able to rotate independently of or synchronously with the rotation of the outlet means as a whole thus the inlet conduit element 1 is fixed to the housing of swivel joint 5 and the first conduit element 2 is fixed to the rotatable shaft thereof indicated generally at 7 the first conduit element 1 is conduit element 3 is fixed to the rotatable shaft thereof indicated generally at 8 the housing of swivel joint 5 and thus inlet conduit element 1 is fixed to a support means indicated generally at 8 39 the details of which are not shown.