Experimental electric fire-engines were made for testing in France, Germany and England starting in the latter part of the nineteenth century. Siemens Brothers Company of London built and experimented with an electric fire engine in 1891. It was shown at the Royal Naval Exhibition in England in 1892. The Paris Fire Department experimented with a self-propelled electric fire engine in 1899. The French electric fire engine, known to them as the automobile pump, was first exhibited at the 1900 World's Fair in Paris and became very popular during its first six months of successful operation. It was demonstrated that this electric fire-engine allowed firemen to begin to extinguish a fire four minutes earlier than a steam fire engine. The fire-engine was self-propelled by on board batteries, and carried a water tank with hundreds of gallons of water that could be used immediately at the site of the fire. The hoses were then connected to the city fire hydrants for more water if needed for a large fire. In 1901, the Paris Fire Department put an electric fire engine into successful operation that also had a hook-and-ladder wagon. It had an electric motor-driven water pump to which hoses were attached for the firemen to use.