Which of these mathematical tools was first designed with a sliding mechanism that revolutionized calculation speed and was marketed as the 'mathematical pocket watch' in the 17th century?

Before digital calculators and computer software became mainstream, mathematicians relied on various physical tools to perform complex calculations. The design evolution of these tools reflects centuries of innovation in both mathematical thinking and product engineering. Test your knowledge about these historical mathematical instruments that revolutionized how we solve problems!

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The slide rule, invented by William Oughtred in 1622, using Napier's logarithms principle
Pascal's calculator (Pascaline), featuring numbered wheels and gears for addition and subtraction
Leibniz's Stepped Reckoner, with its innovative cylindrical gears for multiplication
Babbage's Difference Engine, designed with thousands of precision parts for polynomial calculations