The Mallock machine was an electrical analog computer

Analog computer

An analog computer is a form of computer that uses the continuously-changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved...

 built in 1933 to solve simultaneous linear differential equations. It used coupled transformers, with numbers of turns digitally set up to +/-1000 and solved sets of up to 10 linear differential equations. It was built by Rawlyn Richard Manconchy Mallock of Cambridge University. The Mallock machine was contemporary with the mechanical differential analyser

Differential analyser

The differential analyser is a mechanical analogue computer designed to solve differential equations by integration, using wheel-and-disc mechanisms to perform the integration...

, which was also used at Cambridge during the late 1930s and 1940s.