Vickers and Elswick in the British development trail

Which British gun foundries were involved in the capital-gun autoloader projects?

Vickers appears to have worked on the autoloading system, while Elswick may have been involved through Armstrong gun development.

Vickers appears to be the firm connected with the autoloading system itself. Elswick may also enter the story through Armstrong-related gun work, although that connection is less certain. These industrial names give some shape to an otherwise poorly documented development program. Missing company and Admiralty papers still make the precise division of work difficult to reconstruct.