Set of five 'Cleora' glass tubes, phials of powders and associated objects

Set of five 'Cleora' glass tubes fitted with electrodes and each coated internally with two different phosphors (half the tube length each), clipped into a wooden case (handle broken) also containing a transformer, apparently for demonstrating some of the colours that could be produced in sculptural electrical discharge lamps for architectural or advertising purposes, estimated date 1940-1959, plus an additional tube, a short mains lead and a box containing several phials of fluorescent powders.