The book is a popular exposition of a number of ideas that form the basis of analog computing. Using the example of solving the simplest arithmetic problems, the reader gets acquainted with the most significant features of the analogy method. Next, methods for designing analog computing devices, solving systems of algebraic equations, systems of ordinary linear differential equations, and, finally, devices that reproduce various nonlinear dependencies are described. Designs of the main elements of analogue computer equipment are described. The book is intended for anyone interested in analog computing problems.