Cite

"Improvement in weights & measures", or, Sir John Seeclear discovering [the] ballance of [the] British flag [graphic]

MLA

Gillray, James, 1756-1815, printmaker. "Improvement in weights & measures", or, Sir John Seeclear discovering [the] ballance of [the] British flag [graphic]. [1 December 1798]. https://collections.library.yale.edu/catalog/11823879.

APA, 6th edition

Gillray, James, 1756-1815, printmaker. ([1 December 1798])["Improvement in weights & measures", or, Sir John Seeclear discovering [the] ballance of [the] British flag [graphic]]. https://collections.library.yale.edu/catalog/11823879.