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(Entered LB. 7. 279.)

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Novemb 30. 1675.


An ancient Gentleman I met at your Assemblies (whose name I cannot recollect,) being thick of hearing desired me to inquire after the form of Mr Mace's Otocousticon a Musitian here; but he has not been in town since I came from London, but is somewhere in London about printing a book of Musiue. Yet the last week I had opportunity to inquire after it of his son & he tells me the form is this. A the smal end to put into the ear Figure BC the length suppose two foot CD the wide end suppose about eight inches over. The tube BDC tapers all the way almost eavenly like a cone only at the great orifice CD widens more, like the end of a Trumpet. He has of several sizes. The biggest do the best. If you can't reccollect who the Gentleman may be I suppose Mr Hill can tell you, for I think Mr Hill was by when the Gentleman spake to me, & the Gentleman desired me to write to either Mr Hill or you about it.

Yours in hast

Is. Newton


For Henry Oldenburg Esq.
at his house about the middle
of the Old Pal-mal in




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Mr Newton Letter to Mr Oldenb. concerning the figure of Mr Maces's Otocousticon.

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Ce sont des Lettres {registrees}, mais non pas encore revuës.

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