Wheatstone

Siemens and Wheatstone almost simultaneously invented so much of the dynamo as was yet incomplete.

In 1827, Wheatstone introduced his 'kaleidoscope,' a device for rendering the vibrations of a sounding body apparent to the eye.

Wheatstone's device of the revolving mirror was afterwards employed by Foucault and Fizeau to measure the velocity of light.

At a second interview, Mr. Cooke told Wheatstone of his intention to bring out a working telegraph, and explained his method.

In May they agreed to join their forces, Wheatstone contributing the scientific, and Cooke the administrative talent.