Electric Motor Generator Set consisting of 2x medium sized DC electric motors with permanent magnet fields. 

The motors are coupled together by pulleys and a small belt. One is run as a DC motor while the other behaves as a DC generator. The efficiency of the arrangement can be measured by comparing the electrical energy fed to the motor with the electrical energy drawn from the generator.

Suitable for voltages around 6V.DC. With the belt removed, either motor can be used for any other mechanical purpose. See also EM1760-001

Genuine IEC product.