I was reading from Rayleigh's "The Theory of Sound" from 1877, and one of the first pages is dedicated to this signature which is given a proud position in the center of the page.
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Can you summarize what the book says about the signature ? – Evargalo Oct 27 '20 at 16:04
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The book does not mention it in a single word, the book is all about the physics of sound.. It is like, just there, right on the first page after the title page, with no explanation at all. – Vinzent Oct 27 '20 at 16:05
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2This leads me to suspect that it is a mark of MacMillian Co. Google image search for the win, although hat tip/FGW to @Evargalo – Mark C. Wallace♦ Oct 27 '20 at 16:07
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Looks more like a monogram than a signature. – TRiG Oct 28 '20 at 15:08