The Three Muses repeating gramophone

[Orchorsol]

Do those dished inserts and their square "washers" seem to be made of some kind of fibrous and/or resinous substance?

Well Christopher Proudfoot answers that question in the latest FTR. His article on the "Frusto-Conical Re-entrant Diaphragm" mentions it was patented by a Mr. Cottons who also patented the use of "whalebone stylus bar springs" which were use on The Three Muses' Tremusa soundbox.
Now just that is worth a years subscription of FTR.
Thank you Christopher!

Very interesting indeed.

This information is also mentioned in the October 1978 copy of the Hillandale News 104:

' The Tremusa (also found as the ‘Three Muses’, produced by Repeating
Gamophones Ltd., of Bond St.) is, like the Barcrole, of solid aluminium construction; it has a composition
diaphragm, and the stylus-bar is held in tension by two flat springs of whalebone'.

Link: https://archive.org/stream/HillandaleNe ... 4_djvu.txt

Terrific! I did read that recent article but admittedly, had long since lost interest in my Three Muses soundbox. With its Frusto-Conical Re-entrant Diaphragm indeed - good grief - presumably also vitified with fortamins.

[VanEpsFan1914]

The frustrum of a cone should make for a rather decent diaphragm anyway. It is nothing more than a flattened truncation of a cone after all. Certainly a better notion, at least on paper, than the old flat mica we're used to in early reproducers.