Ernst Abbe

German physicist, entrepreneur, and social reformer (1840–1905)

Ernst Karl Abbe (23 January 1840 – 14 January 1905), was a German businessman, optical engineer, physicist, and social reformer. Together with Otto Schott and Carl Zeiss, he developed numerous optical instruments.²

From Wikipedia’s article on Ernst Abbe (this version), CC BY-SA 4.0.

Born Jan 23, 1840, died Jan 14, 1905.¹