Which mathematical tool's modern design was significantly improved by Joseph Huddart in the late 18th century for naval applications before becoming a classroom staple?

Product design in mathematics has evolved significantly over centuries, creating tools that have become essential in classrooms worldwide. The intersection of mathematics and product design has led to innovations that simplify complex concepts and calculations. This trivia question explores the fascinating history behind one of the most recognizable mathematical tools and how its design has influenced mathematical education.

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The protractor
The compass
The slide rule
The abacus