Question: The Playfair cipher was invented in 1854 by an English scientist and inventor of many scientific breakthroughs of what era?
Sentence (from "Charles Wheatstone"): However, Wheatstone is best known for his contributions in the development of the Wheatstone bridge, originally invented by Samuel Hunter Christie, which is used to measure an unknown electrical resistance, and as a major figure in the development of telegraphy.
Relevant evidence: No