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"the Plan of your Armonica improved..."

Date: 1775, May 20
From: Jonathan Williams Jr. (London)
To: BF (London)
PBF: 22: 49

Apparently in April, during his visit to Paris, Williams had met the duchesse de Villeroi and learned of her improvement on Franklin's armonica. "Instead of playing with the Fingers on the Glass she had contrived to fix Keys so that one Plays the same as with the Harpsichord. Her Grace has engaged to give me a Plan and Description of it." The plans have been lost. 1

Dear and honoured Sir:

Since my last I have recvd from La Duchesse de Villroy the Plan of your Armonica improved, which you will receive by this ship....