1820 engraving, "Writing by Cipher" showing a musical code for a poem.

- Image ID: BY4XDE
1820 engraving, "Writing by Cipher" showing a musical code for a poem.
Old Paper Studios / Alamy Stock Photo
Image ID: BY4XDE
From Rees's Cyclopædia, or The New Cyclopædia, or, Universal Dictionary of the Arts and Sciences, edited by Reverend Abraham Rees (1743-1825).