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.

Ornate signature/glyph

  • Can you summarize what the book says about the signature ?
    – Evargalo
    Oct 27, 2020 at 16:04
  • 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. Oct 27, 2020 at 16:05
  • 2
    This leads me to suspect that it is a mark of MacMillian Co. Google image search for the win, although hat tip/FGW to @Evargalo
    – MCW
    Oct 27, 2020 at 16:07
  • Looks more like a monogram than a signature.
    – TRiG
    Oct 28, 2020 at 15:08

1 Answer 1


This image seems to be the signature of the editing house, the MacMillan company. official logo of MacMillan & Co

Title page of a book showing the Macmillan company symbol

You can find other versions of their logo on their wikipedia entry.

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