Some odd / unusual tubes and lamps

Some odd tubes and lamps

Any information about these tubes is welcome !

National Union 6090 commutator tube
18 Channel Radial Beam Tube, electrostatically focused and deflected

EMR (Electro-Mechanical Research, Inc. - Princeton, New Jersey) ASCOP Multiplier Phototube type 541A

An Augetron, an electronic multiplier valve named after Pierre Auger
of France who discovered the effect in 1926.

French Carcinotron F4029C, a backward wave oscillator made by CSF

Closeup of the tube (inside of a powerful circular magnet):

Secondary Emission Multiplier

The second tube on the next picture is a developmental magnetic-type multistage photomultiplier, reported by V.K. Zworykin, G.A. Morton and L. Malter in 1936. At this time, the principal contemplated application was sound-on-film pickup. This multiplier, the first one to be multistage, used a combination of magnetic and electrostatic fields to direct electrons from stage to stage. The first six stages were supplied from an internal divider; the remaining stages were supplied from an external source. Although it provided high gain, the adjustment of the magnetic field was very critical. For this reason, and because of other drawbacks, commercialization did not follow.

The function of the other tube is unknown.