English: Image of fig.442 from plate XXX from Thomas Young's "Lectures", publ. 1807, the text of lectures to London's Royal Institution in 1802. Shows Young's experience of the "two slit" phenomenon, which supports wave theory of light.
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Source
Original publication: A Course of Lectures on Natural Philosophy and the Mechanical Arts- YOUNG, Thomas
Immediate source: This jpg created by me (who releases all rights) from a jpg emailled to me from a bookseller (www.jonathanahill.com) who was selling the book. Bookseller was responding to email asking if okay to send image to Wikipedia, told that meant giving up his rights.
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