Barr and Stroud Ltd. (1922). The submarine periscope: An explanation of the principles involved in its construction, together with a description of the main features of the Barr and Stroud periscope. Barr and Stroud.

Barr and Stroud Ltd. The Submarine Periscope: An Explanation of the Principles Involved in Its Construction, Together with a Description of the Main Features of the Barr and Stroud Periscope. Glasgow: Barr and Stroud, 1922.

Barr and Stroud Ltd. The Submarine Periscope: An Explanation of the Principles Involved in Its Construction, Together with a Description of the Main Features of the Barr and Stroud Periscope. Barr and Stroud, 1922.