Medical device Magneto Electric Machine dating from the 19th century. This is a beautifully made example, the components are secured to a solid brass frame next to a large steel magnet and fixed into mahogany case, the original makers label remains intact in the lid. The cranking handle detaches and sits within the case when not in use. The device is sold as a decorative curiosity, it is complete and original but untested, as a quack medical device we might consider that it was probably always ineffective. The idea, as the instructions in the lid point out, was for the patient to apply the two electrodes to the body whilst an electrical current is generated by cranking the machine. The key is included and works the lock correctly, there is a small crack in the case lid.
In the 1800s, mild electric shocks were a popular treatment for a range of aches and pains, especially those associated with the nerves. Electricity was produced using the large magnet and the strength of the electric shock was controlled by how fast the crank was turned. The brass handles were placed on the patient’s body to deliver the shock. To prevent the patient feeling too much pain, it was recommended that a wet sponge be placed between the handle and the body.
 
The case measures 25.7 x 12.2 x 11.5cm (10.12" x 4.8" x 4.53") and weighs 2.65kg (5.84lbs).
 
The Science Museum in London has an example which can be seen here:
 
https://collection.sciencemuseumgroup.org.uk/objects/co143447/improved-patent-magneto-electric-machine-for-nervous-diseases-electrotherapy