BJ Super 90 Tangential Tonearm

An improved version of the BJ pickup arm, to be known as the "Super 90". has been developed by Berne-Jones and Company Limited.

In reviewing the original model we pointed out that the low tracking error (less than ±1 degree) could be realized only by careful attention to the position of the tone-arm pedestal, which must be re-set whenever the pickup cartridge is changed for one of different length.
This adjustment is made in the "Super 90" by a built-in guide with calibrated scale, and detailed instructions are given for setting up with most of the leading British and American pickup cartridges. Two plug-in plastic shells are provided with each arm, for housing alternative cartridges.
An additional feature of the new design is the counterweight system which uses continuously adjustable slide weights in conjunction with fixed lead discs, contained in a recess below the nameplate. Wireless World March 1956, Page 119.

See

Here you find 23 models, 17 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Magnum (brand) Burne-Jones & Co. Ltd.; London