A surviving Jennings Electronic Industries R.L.S.5
The main overview of Jennings rotating speakers can be found here. The R.L.S.5 was produced and promoted by Jennings from 1968 to 1972.
Thanks to Bernhard, a superb set of shots of a surviving Rotating Line Source 5 column. Its speakers, four mounted on the rotating shaft, one in the base of the unit facing upwards, are Celestion 8842s - 10", 8 ohms impedance, NIB4 cones. Cabinets will have been costly to produce and assemble: the internal structure is unusually complex (as can be seen).
Some details