Carroll & Meynell Carryvolt autotransformer is an ideal piece of portable test equipment for varying supply voltage. These carryvolt transformers have three optional output sockets to connect to the items being tested, they also incorporate meters for general indication.
The carryvolt internally contains a round carbon brush for smoother operation and a long life.

Output sockets and test sockets
Output Voltmeter and Ammeter
Power on indicator
Low current density in round carbon brush. Low Magnetising Current
Rugged Construction. Negligible Maintenance and trouble free long life
Thermal magnetic circuit breaker on/off switch for overcurrent protection
High Efficiency. No Waveform Distortion. Excellent Regulation.

Variable Auto Transformers

Continuously variable alternating current (a.c.) output voltage
Rugged construction
Low operating torque
High efficiency/excellent regulation

Silver-plated commutator
Low magnetising current
No waveform distortion, smooth linear output & overload capacity
Screw terminals
Complete with knob and dial