Benjamin Franklin's glass harmonica in an italian publication.
<p>LoC notes: Before leaving London in July 1762, Franklin wrote to the Italian philosopher Giambatista Beccaria. Not having anything new to report on their shared interest in electricity, Franklin described the improvements he had made to the musical glasses invented by Richard Puckeridge. [...] 
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LoC description: L'Armonica: Lettera del Signor Beniamino Franklin al Padre Giambatista Beccaria, Regio Professore di Fisica nell' Univ. di Torino. Page 2 [Milano?:1776?]
unknown / undecipherable
~1776[?] (acc. Library of Congress)
<a rel="nofollow" class="external free" href="https://www.loc.gov/exhibits/treasures/images/bf0043s.jpg">https://www.loc.gov/exhibits/treasures/images/bf0043s.jpg</a> The picture refers to some letter of B. Franklin to Abbé <a href="https://en.wikipedia.org/wiki/Giambatista_Beccaria" class="extiw" title="en:Giambatista Beccaria">en:Giambatista Beccaria</a> in ~mid-1762.