| http://www.w3.org/ns/prov#value | - The spacer shroud 38 has an axial length of 30 mm and diverges from an upstream diameter of 12 mm to 30 mm. [0072] The examples shown in FIGS. 5 to 7 may be modified for laboratory use by providing in the wall of the barrel portion 24 an inlet port connected to a source of e.g. helium via which the chamber 25 can intermittently be pumped up to the initial pressure of 2-4 bar.
|
