Final answer:
Wilhelm Schickard developed the Schickard Calculator, an early mechanical device for calculations.
Step-by-step explanation:
Wilhelm Schickard developed a machine known as the Schickard Calculator in the 17th century. It was one of the earliest mechanical devices designed to perform calculations. The machine used a series of gears and rotating cylinders to automatically add and subtract numbers based on a set of input dials. Although no physical evidence of the machine remains, Schickard's letters and sketches detailing its design and capabilities serve as evidence of its existence.