A desk-model electronic analog computer

A description is given of an analog computer comparable in size to an automatic desk calculator. By combining the techniques of electronic and electric analogs, a high problem-solving capacity is achieved in a minimum of space. Nine stable high-gain dc amplifiers are provided, each of which can be made to produce a variety of functional responses. This is accomplished by allowing the operator to build up the input and feedback networks of each amplifier on a plug board, on which space is provided for additional networks involving resistors, capacitors, and crystal diodes. The plug board containing all the components and interconnections involved in a given problem can be stored in a filing cabinet when not in use. The low cost and small size of the computer make it suited for use in many situations in which an analog computer would not otherwise be used.