Nikola Tesla

Nikola Tesla was born in 1856 in Smiljan Lika, Croatia. He was the son of a Serbian Orthodox clergyman. Tesla studied engineering at the Austrian Polytechnic School. He worked as an electrical engineer in Budapest and later emigrated to the United States in 1884 to work at the Edison Machine Works. He died in New York City on January 7, 1943.

During his lifetime, Tesla invented fluorescent lighting, the Tesla induction motor, the Tesla coil, and developed the alternating current (AC) electrical supply system that included a motor and transformer, and 3-phase electricity.

Tesla is now credited with inventing modern radio as well; since the Supreme Court overturnedGuglielmo Marconi's patent in 1943 in favor of Nikola Tesla's earlier patents. When an engineer (Otis Pond) once said to Tesla, "Looks as if Marconi got the jump on you" regarding Marconi's radio system, Tesla replied, "Marconi is a good fellow. Let him continue. He is using seventeen of my patents."

The Tesla coil, invented in 1891, is still used in radio and television sets and other electronic equipment.

Nikola Tesla - Mystery Invention

Ten years after patenting a successful method for producing alternating current, Nikola Tesla claimed the invention of an electrical generator that would not consume any fuel. This invention has been lost to the public. Tesla stated about his invention that he had harnessed the cosmic rays and caused them to operate a motive device.

In total, Nikola Telsa was granted more than one hundred patents and invented countless unpatented inventions.

Nikola Tesla and George Westinghouse

In 1885, George Westinghouse, head of the Westinghouse Electric Company, bought the patent rights to Tesla's system of dynamos, transformers and motors. Westinghouse used Tesla's alternating current system to light the World's Columbian Exposition of 1893 in Chicago.

Nikola Tesla and Thomas Edison

Nikola Tesla was Thomas Edison's rival at the end of the 19th century. In fact, he was more famous than Edison throughout the 1890's. His invention of polyphase electric power earned him worldwide fame and fortune. At his zenith he was an intimate of poets and scientists, industrialists and financiers. Yet Tesla died destitute, having lost both his fortune and scientific reputation. During his fall from notoriety to obscurity, Tesla created a legacy of genuine invention and prophecy that still fascinates today.

The Development Of Electric Motor

As is so often the case with invention, the credit for development of the electric motor belongs to more than one individual.  It was through a process of development and discovery beginning with Hans Oersted's discovery of electromagnetism  in 1820 and involving additional work by William Sturgeon, Joseph Henry, Andre Marie Ampere, Michael Faraday, Thomas Davenport and a few others. 

The first electric motors - Michael Faraday, 1821 From the Quarterly Journal of Science,  Vol XII, 1821

Using a broad definition of "motor" as meaning any apparatus that converts electrical energy into motion,  most sources cite Faraday as developing the first electric motors, in 1821.   They were useful as demonstration devices, but that is about all, and most people wouldn't recognize them as anything resembling a modern electric motor. There are several Faraday motors in the collection. 

Faraday Motor from the collection 1830's

The motors were constructed of  a metal wire suspended in a cup of mercury  (See illustration at right). Protruding up from the bottom of the cup was a permanent magnet. In the left cup the magnet was attached to the bottom with a piece of thread and left free to move, while the metal wire was immobile.   On the  right side, the magnet was held immobile and the suspended wire was free to move. 

When current from a Volta pile was applied to the wire, the circuit was completed via the mercury ( a good conductor of electricity) and the resulting current flowing through the wire produced a magnetic field. The electromagnetic field interacted with the existing magnetic field from the permanent magnet, causing rotation of the magnet on the left, or of the wire on the right.

Barlow's Wheels

The Barlow wheel (also known as the Faraday wheel) was first built in 1822 by the English mathematician and physicist Peter Barlow (1776-1862).

Mercury is poured into the trough located on the base of the apparatus. The wheel is lowered until a spoke just dips into the mercury. Voltage applied to the binding posts will cause rotation of the wheel.

Barlow's Spur-Wheel Benjamin Pike 1848 Barlow's Wheel 1890

Barlow's Spur-Wheel and Faraday's Rotating Wire Possibly Benjamin Pike 1848 Double Barlow's Wheel Watkins and Hill 1845

Revolving Spur-Wheel Daniel Davis 1848

Rotating Magnet Motors

Page's Rotating Motor Charles Page 1840	Ritchie's Motor 1830's  Very primitive electromagnetic motor invented by Rev. William Ritchie; "probably the first man to produce the rotary motion of an electromagnet," in 1833 (The Development of Electrical Technology in the 19th Century, United States National Museum Bulletin 228, Washington; D.C. 1962).	Ritchie's Apparatus English1838Also known as "Electromagnet rotating between a soft-iron horse-shoe."
William Sturgeon Mercury Interrupter English 1838 Described in "Annals of Electricity, Magnetism and Chemistry" Vol. III, London 1838 pgs 331-334, Plate Il figs. 15 and 16.	De La Rive's Apparatus for Showing the Directive Properties of an Electrified Wire Likely Watkins and Hill 1828  Also known as De La Rive's Floating Battery. Primitive electro-philosophical devices. Described on pages 71-72 and illustrated in figs 7 & 8 in A Popular Sketch of Electromagnetism or Electro-Dynamics, Francis Watkins 1828; also in Watkins and. Hill 1845 Catalog pg. 9 figs. 77 & 78.  These are also described in Treatises on Electricity, Galvanism, Magnetism and Electro-Magnetism by P.M. Roget (1832) also described and illustrated in Palmer's Trade Catalog of Electro-Magnetic and Voltaic Devices, London, 1838.	William Sturgeon Mercury Interrupter English 1830
Apparatus to Exhibit the Deflection and Rotation of an Electrified Wire about the Pole of a Fixed Horizontal Magnet English 1840's	Revolving Magnet Benjamin Pike Jr. 1848	Faraday's Motor With Mercury Cups American 2nd Qtr, 19th Century

Contracting Helix Daniel Davis 1848   When a current is applied, the electromagnetic field causes the coils to attract one another, lifting the wire from the mercury pool. This breaks the connection, the coil relaxes, the connection is re-made, and the cycle repeats.  A very simple form of electric motor.	Ampere's Rotating Battery Likely Benjamin Pike Jr. 1848	Thermo-Electric Revolving Wire Frames Likely Daniel Davis 1842	Early Faraday Motor Watkins and Hill 1830
Single Ampere's Rotating Battery American 1848	Revolving Electromagnet Daniel Davis 1848	Device Demonstrating the Rotary Action of a Magnet on a Conducting Wire when Coiled into a Helix Watkins and Hill 1830's
Apparatus to Exhibit the Deflection and Rotation of an Electrified Wire about the Pole of a fixed Horizontal Magnet Watkins and Hill 1830's	Primitive Early Faraday Rotating Wire Experiment 1830's	Apparatus to Exhibit the Rotation of Two Hollow Cylinders about the Poles of a Magnet when an Electric Current Flows through the Cylinders English or Italian 1840.

Simple Armature Motors

Revolving Armature Engine 1848	Upright Reciprocating Engine Probably Daniel Davis 1842	Revolving Armature Engine Daniel Davis 1848
Unusual Electric Motor English 1860	Electrodynamic Revolving Ring Probably Daniel Davis 1848	Magnetic Motor French 1870

Other Early Motors

Magnetic Beam Engine Pike and Son 1840		Reciprocating Engine Probably Daniel Davis Early 1840's
Unusual Electric Motor English 1860		Electromagnetic Motive Engine Likely Watkins and Hill 1845
Magnetic Motor French 1860's		Magnetic Motor French 1860's
DEMONSTRATION ELECTRO-MOTOR TRAIN French, circa 1850-1860 Made of brass, steel, copper and wood, measures 5-1/2" length. Early example of an electromotive train. Has two electromagnets, a 10 pole rotor geared to the main axle. The other axle free to pivot, and designed to ride on a 2-1/2" gauge track.		DEMONSTRATION ELECTRO-MOTOR TRAIN French, mid- 19th century  Unsigned; made of brass, copper, wood, steel and iron. An early example of an electromotive "train". It is 8" long, equipped with four electromagnets, a twelve pole rotor on the main axle, commutator wheels and contacts. The six-spoked main wheels are designed to ride on 3-3/4" gauge track; the front wheels are off center; designed for a circular track of fixed radius. Elegant and very rare demonstration piece, in fine condition.
Electromagnetic Engine Gustav Froment 1848		Horizontal Axial Engine Daniel Davis Jr. 1840's
Charles Page Reciprocating Electromagnetic Engine 1840's		Electro-Medical Double Helix and Reciprocating Armature Engine Jerome Jewell 1848

Close-up of Edison Electric Fan

Emerson Electric Fan

Edison DC Electric Fan ca. 1898

Kent Electric Co. electric fan
ca. 1898
One of the first products made and sold by Atwater Kent,
who would later become the world's largest manufacturer of radio receivers.

Geissler Tube Rotators and Similar Motors

Magnetic Motor French 1870	Magnetic Motor French 1870	Magnetic Motor French 1870 This magnetic engine has a six-pole rotator with a wood and brass holder and original Geissler tube attached designed to spin with the engine creating a dazzling light display	Magnetic Motor French 1860's
Magnetic Motor French 1870	Magnetic Motor RotatorManufacture Francaise, Armes et Cycles, Saint-Etienne 1870	Magnetic Motor French 1870	Magnetic Motor Rotator French 1870
Magnetic Motor French 1860's The rotator is unusual in that the poles are shaped as small iron cylinders measuring 1-1/2" in length.	Magnetic Motor French 1870	Magnetic Motor French 1870	Magnetic Motor French 1870
Magnetic Motor with Four Electromagnets French 1850's Four vertically positioned electromagnets angled on a 10░ slant toward each other power a 5-pole large rotator. 6-1/2" in total height. Very unusual design for an electromagnetic engine.	Magnetic Motor French 1850's

Dynamos & Related Electromagnetic Apparatus

Waltenhofen's Electromagnetic Pendulum by Max Kohl (German) 1900	Waltenhofen's Electromagnetic Pendulum This apparatus is used to demonstrate Lenz's law, which states that the induced current in a closed conducting loop always flows in such a direction as to oppose the change that produced it. The law corresponds to the law of conservation of energy in electromagnetism. The device consists of a pendulum, with a pendulum bob of a two dimensional shape made of a non-ferromagnetic conducting material thats is set swinging between the poles of an electromagnet. The effect of Lenz's law is seen by the rapid braking of the pendulum.	Bipolar Dynamo c. 1900
Electric Motor The M. Cornwell Co. Syracuse, New York, USA". 1890	Bipolar Dynamo	No. 30 'Tesla Thriller' Generator Kendrick and Davis (K&D) 1st Qtr 20th Century
Magnetic Motor Wooley Magnetic Engine Co. 1885
Tesla MotorThis is a model of an early three phase motor designed by Nickola Tesla. ``In our dynamo machines, it is well known, we generate alternate currents which we direct by means of a commutator, a complicated device and, it may be justly said, the source of most of the troubles experienced in the operation of the machines. Now, the currents, so directed cannot be utilized in the motor, but must - again by means of a similar unreliable device - be reconverted into their original state of alternate currents. The function of the commutator is entirely external, and in no way does it affect the internal workings of the machines. In reality, therefore, all machines are alternate current machines, the currents appearing as continuous only in the external circuit during the transfer from generator to motor. In view simply of this fact, alternate currents would commend themselves as a more direct application of electrical energy, and the employment of continuous currents would only be justified if we had dynamos which would primarily generate, and motors which would be directly actuated by, such currents.''