Atlas Commemorative E.R. Coronation Lamp

Based on simple neon glow discharge technology, this lamp was manufactured to celebrate the occasion of the Coronation of Her Majesty Queen Elizabeth the Second, in June 1953.

Four variants of Coronation neon lamps are known to have been created. This example was manufactured at Sir Jules Thorn's first lamp factory, the Atlas Lamp Works on Angel Road in Edmonton, North London. It is clear that this lamp is intended for cap up operation, but an equivalent product was also offered to read correctly when installed in cap down fittings. Osram-GEC also manufactured two very similar products at their Hammersmith works, also in London. The GEC is known to have issued one lamp to each employee at the factory however it is not known whether or not any of these lamps were offered for sale to the public, or how many were manufactured.

Technologically, this lamp is made along the same lines as the Beehive Neon nightlight lamps offered by both companies. The electrodes are fabricated from Swedish Iron wire, which was employed because it offered a greatly reduced rate of sputtering and consequently the problem of bulb blackening, commonly found in inferior neon lamps, could be alleviated. The glass envelope contains a neon-argon Penning mixture substantially the same as is employed in the majority of low pressure sodium lamps. Ballasting is accomplished by a wirewound and porcelain encased resistor which is housed inside the brass cap. The Crown forms one electrode, the "ER" forming the other, its supply wire being insulated by a glass sleeve. A corona discharge causes a glow to envelop all exposed metal areas.
Manufacturer: Thorn Electrical Industries Ltd.
Lamp Power: 5 Watts
Lamp Current: 0.20 Milliamps
Lamp Voltage: 230-260 Volts
Cap: B22d/25x26 (Brass)
Bulb Finish: Clear
Bulb Type: PS-68
Overall Length: 125 mm
Light Centre Length: N/A
Electrodes: Swedish Iron wire
Atmosphere: Neon-Argon Penning mixture
Luminous Flux: N/A
Luminous Efficacy: N/A
Colour Temperature: N/A
Chromaticity Co-ordinates: N/A
Rated Life: Not Published
Factory: Angel Road, Edmonton United Kingdom
Date of Manufacture: June 1953
Original / Present Value: Not Known