I didn't see mentioned the planimeter: "A planimeter, also known as a platometer, is a measuring instrument used to determine the area of an arbitrary two-dimensional shape." ~ https://en.wikipedia.org/wiki/Planimeter
> “The applications of the integraph are very numerous. With it we calculate areas, divide areas, determine centres of gravity, calculate moments of stability, load and resistance, solve algebraical equations, draw parabolas, etc.”
> “The applications of the integraph are very numerous. With it we calculate areas, divide areas, determine centres of gravity, calculate moments of stability, load and resistance, solve algebraical equations, draw parabolas, etc.”