Opening his own, similar museum, known as 'Merlin's Cave' in 1773, he was renowned for his innovative musical instruments and for the ingenuity of his numerous inventions. The Earl of Mansfield purchased one of these inventions, a 'Balance Sanctorius' or set of miniature scales for the music room at Kenwood and it is interesting that Merlin holds a similar instrument in his left hand in this portrait. Gainsborough has painted Merlin as a living presence, alert and mobile and presented as if about to engage in conversation.