genatore di Pixii
Hippolyte Pixii generator - 1833 -
Farady had discovered that magnetism can make, or induce, electric current only when the wire that carries current and the lines of magnetic force move so that they cut across each other. A rotating loop is ideal for this pourpose.
In some machines magnetic field rotate and the loop stay still.
The Pixii's generator was drived by hand. Ampere had suggested to Pixii to add a split-ring commutator to produce direct current. The alternating current gave problems heating the iron magnetic core by eddy currents.
In figure is showed the model built in 1833.

Stoehrer, a german inventor who lived in Lipsia, built in 1934 a generator with 3 permanent magnets at horse-shoe placed for induce a current in a 6 poles induct.
One of those generators is exposed at Science Museum of London.
In 1846 all was ready to build greater and more efficient generators to join to a steam engine.
Generatore di Stoehrer - 1834 -
Stoehrer generator - 1834 -
Generatore di E.M.Clarke - 1834 -
E.M.Clarke generator-1834
The first man to build generators and sell them in great quantity was E.M.Clarke who, in 1830, was instrument maker in London. His first models were for scientific laboratories which needed higher tension than those of chemical batteries.
In those years was general opinion that the electomagnetic generators could have therapeutics properties.
It is not surprising if those generators were built in a large scale by Clarke and by others manifacturers.
The patient had to hold two metallic knobs and the amount of electricity depended on crank velocity.

Zenobe Thèophile Gramme built the first dynamos with practice dimensions capable to produce a true direct electric current.
The success of the Gramme machine was prompt and has been used for several applications as lighthouses, electrolating and electric light in the establishments. The dynamos of Gramme were drived by steam engines.

dinamo di Gramme
Dynamos of  Gramme - 1870 -
First power plant                     Table of contents