\paragraph{Mr. Cartwright}

A certain Mr. Cartwright (his first name is a mystery) performed on the musical glasses in
London in April, 1783. The British Museum possesses a handbill, on which

\begin{quote}
Mr. Cartwright respectfully acquaints the nobility and gentry that he has taken Mr. Sechard's convenient rooms at no. 115 Pall Mall, next to Carlton House, where, in a style peculiar to himself, he will perform on the Musical Glasses.\ldots The reception he met with at Bath, and the persuasion of those people of fashion, who countenanced him there, have encouraged him to exhibit in the Metropolis. The dulcet tones, in imitation of the human voice, and soft notes of harmony, which have gained an admirer in every person who has honoured the performance, are
the recommendation on which Mr. Cartwright rests for public support.\ldots It having been thought that the
Musical Glasses would not admit of great execution, Mr. Cartwright (hopes not presumptuously) takes the liberty of informing the public
that he plays Fischer's favourite minuet, with all its variations, and several others, no less 
difficult, which were never attempted by any other performer in public, on the glasses.
\footnote{Quoted in King (1946) p.116}
\end{quote}

On February 1st, 1787, Cartwright returned to Bath, as advertised in the \Title{Bath Chronicle}:

\begin{quote}
Upper rooms. By desire. Mr. Cartwright's Public Breakfast will be on Saturday the 3d of
February, 1787, attended with French Horns, Clarionets, etc. After breakfast Mr. Cartwright will perform on his new-invented grand set of musical glasses, several favourite compositions of Handel's Fischer's and Shield's etc.
\footnote{Quoted in King (1946) p.116}
\end{quote}

A second advertisment, of February 22nd, repeats the sentence ``The dulcet tones\ldots'' from 
his London announcement of 1783, and adds the following: ``He also constructs this melodious apparatus for sale. Terms for instruction, 3 lessons for one guinea, one guinea entrance.'' Apparently Cartwright continued to tour for some time, for in an 1827 encyclopedia, the article on the ``Harmonica'' includes:

\begin{quote}
Some readers will recollect the performance of Mr. Cartwright a few years ago in different parts of Britain. In the latter case (i.e. Cartwright's as contrased with the harmonica proper) the glasses are arranged in a frame or box.\footnote{``Harmonica'', \Title{Encyclopedia Edinensis} (1827) vol. 4, p.103; quoted in King (1946) p.116}
\end{quote}