Abstract :
To make the best use of the analog computer, the problem to be solved needs to be modified to fit into the limits of the best operating region of the computer. This leads to the time and amplitude scaling of the problem. Conventionally only the positive values of time scale factors are considered. In this letter the negative values are also considered and this is achieved by introducing inverters in series with the integrators. Negative time scaling effectively means the time reversal of the solution. The practical use of this technique is illustrated by the examples, considered at the end of the letter.
