Collections: Dawn of the Electrical Age (1600-1800)
Winter Friction Machine
The first devices for producing electricity were very simple.
The ancient Greeks discovered the strange effects of amber rubbed
with fur and other material. In the 17th century, scientists used
sticks of resin or sealing wax, glass tubes and other objects. By
the time of Benjamin Franklin, large glass tubes about three feet
long and from an inch to an inch and a half in diameter were
popular. These were rubbed either with a dry hand or with brown
paper dried at the fire.
There are two major categories of electrical machines: Friction and Influence. A friction machine generates static electricity by direct physical contact; the glass sphere, cylinder or plate is rubbed by a pad as it passes by. Influence machines, on the other hand, have no physical contact. The charge is produced by inductance, usually between two or more glass plates spinning in opposite directions.
All through the 18th and 19th centuries there was tremendous interest in electricity. Scientists such as Franklin, Nollet, Coulomb, Volta, Oersted, Ampère, Ohm, Faraday, Joule and others made major advances. Prior to the invention of the induction coil in 1831 however, the only way to generate high voltage electricity was via static generators such as these.
In devices similar to the Winter Friction Machine shown opposite, rotating the wheel created a static charge, which was available on the "prime collector" (the brass ball or cylinder at the top or front of the device.) The charge could then be stored in a Leyden jar or measured with an electroscope.
Shown: Winter Friction Machine. c. 1900« Return to Collection