| 11. | Conductivity is traditionally determined by connecting the electrolyte in a Wheatstone bridge.
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| 12. | His code was an important advance over Wheatstone's signaling method.
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| 13. | Wheatstone was also the first to patent a Duet concertina, in 1844.
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| 14. | One of the most famous was the Wheatstone concertina.
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| 15. | William Fothergill Cooke and Charles Wheatstone developed a telegraph around 1838-40.
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| 16. | In 1840, Sir Charles Wheatstone developed the stereoscope.
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| 17. | Charles Wheatstone first began experimenting with stereopsis in 1838 using specially constructed drawings.
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| 18. | In 1840 Wheatstone was using a magneto that he developed to power the telegraph.
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| 19. | In later years Wheatstone often returned to Barnwood.
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| 20. | In 1925, Besson purchased Quilter, and Wheatstone & Co . in 1940.
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