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The ball on a stick is a coupling to the working waveguide/cavity, and there should be some matching magnets for it to function. Its certainly a magnetron, the "wire spring" is the thermionic element.
[3.2] BRITISH CENTIMETRIC RADAR* The first operational British 10 cm (3 GHz) or "S-band" set was the shipboard "Type 271", which was rushed into production within months, with sea trials performed on a production set in March 1941. The Type 271 was a crude system, with manual direction and separate transmit and receive antennas, each in the form of a wide short open-faced box with a parabolic back and stacked on top of each other. The antenna configuration was nicknamed "Cheese", apparently because the antennas looked like they had been cut from the side of a round of cheese.The Type 271 led to a long series of naval and ground-based radars, worth listing here though it is getting ahead of the story. The next step was the "Type 273" for major warships, with sea trials conducted in August 1941. The Type 273 used side-by-side parabolic dishes, each 90 centimeters (a yard) in diameter, and it was the first radar to be mounted on a gyrostabilized platform, like a naval gun, to keep it on target. Later versions had a PPI display.A "CD Mark IV" version of the Type 271, sometimes just called the "Type 271 CD", was designed for coastal defense, featuring antennas with an aperture of 2 meters (6 feet 7 inches). Since the narrow microwave beam was effective at very low angles, the CD Mark IV, and its "Mark V" and "Mark VI" successors, were sometimes referred to as "Chain Home Extra Low (CHEL)". The Army CD Mark VI was also used by the RAF, being designated the "AMES Type 52", going through various refinements that were designated "AMES Type 53" through "AMES Type 56".The Royal Navy continued to improve on the Type 271/273 design to come up with the "Type 277" 10 cm (3 GHz) radar, which was also used by the RAF in a mobile installation as the "AMES Type 14". The initial marks of the AMES Type 14 used dual cheese-style antennas, mounted horizontally, though late marks had a lighter and more effective antenna.The Royal Navy Type 277 was used as the basis of an RAF "centimetric heightfinder (CMH)" radar, the "AMES Type 13", which preceded the AMES Type 14 into service. The CMH used Type 277 electronics, coupled to a stacked dual cheese-style antenna that was mounted vertically, creating a horizontally flattened beam that was ideal for determining heights of intruders. The AMES Type 13's antenna rocked back and forth or "nodded" vertically, from one degree down to 20 degrees up, to scan for targets. Later marks of the Type 13 discarded the heavy cheese antenna for a lighter and more effective mesh-style antenna.
Radar AA No3 MkII
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