40 mm Bofors AA guns made in GB and US

[Ewan WT]

I have just joined the Forum to research the Dome Trainer. This was the first anti-aircraft simulation technology invented by my grandfather, Lt-Commander Henry Stephens, for the Royal Navy in 1940. This is the Pathe News in 1951.

https://www.britishpathe.com/video/dome-trainer

Henry's private journal has been deposited in the Imperial War Museum and the BBC made a documentary in 2025, narrated by the British actor Stephen Fry. YouTube has parts of the documentary.

There was a huge demand for this technology with 43 domes being built across the UK including one at Langham which survives today. This puzzling dome structure was a forerunner of today's immersive experiences including Imax screens, aircraft pilot simulation and computer games. This revolutionary invention saved thousands of lives and shortened the Second World War.

https://www.iwm.org.uk/collections/i...ect/1030031411

https://www.bbc.co.uk/programmes/p02rcd2x

https://www.bbc.co.uk/programmes/p02rc8dl

I would be pleased to have any more information on the Dome Trainer and the gunnery used inside it. At Scapa Flow there is a further installation of what looks like a rear gunner turret developed for air-to-air gunnery. This is not in any of the official records that I can find!

Best wishes,

Ewan Ward-Thomas
Grandson of Henry Stephens, RN