Another stream of nitrogen comes from a concentric tube within the spray needle assembly, which surrounds the solvent spray as it emerges from the inner spray needle.
12.
A design aspect of the Supermarine Spitfire wing that contributed greatly to its success was an innovative spar boom design, made up of five square concentric tubes that fitted into each other.
13.
An inductively coupled plasma ( ICP ) for spectrometry is sustained in a torch that consists of three concentric tubes, usually made of quartz, although the inner tube ( injector ) can be sapphire if hydrofluoric acid is being used.
14.
In the late 19th century the Dent company marketed a further development of the zinc gridiron in which the four outer rods were replaced by two concentric tubes which were linked by a tubular nut which could be screwed up and down to alter the degree of compensation.
