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Home > Images Dated > 2004 > May > 11 May 2004

Images Dated 11th May 2004

Choose from 12 pictures in our Images Dated 11th May 2004 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Lecture on Stephen Grays discoveries in electricity Featured 11 May 2004 Image

Lecture on Stephen Grays discoveries in electricity

A lecture at the Charterhouse, London on Stephen Gray's discoveries in electricity. In the early eighteenth century, Gray demonstrated that charges of electricity could be conducted by some materials for distances as great as 765 feet, while others did not conduct electricity at all. Eventually, he was able to send charges through 88 metres of wire suspended on silken threads to operate an electroscope - an instrument used to detect static electricity. By sending an electrical signal from one place to another, Gray established the basic principle of the electric telegraph

© Illustrated London News Ltd/Mary Evans