Aimé Argand

François Pierre Ami Argand
150px François Pierre Aimé Argand
Born	5 July 1750 Geneva, Republic of the Swiss
Died	14 October 1803 Geneva, Switzerland
Residence	Switzerland, England
Nationality	Swiss
Fields	Chemistry Physics
Known for	oil lamp
Influences	Horace-Bénédict de Saussure Antoine de Foucroy

François Pierre Ami Argand (5 July 1750 – 14 October 1803) was a Swiss physicist and chemist. He invented the Argand lamp, a great improvement on the traditional oil lamp.

Early years

Francois Pierre Ami Argand was born in Geneva, Switzerland, the ninth of ten children. His father was a watchmaker, who intended for him to enter the clergy. However, he had an aptitude more for science, and became a pupil of the noted botanist and meteorologist Horace-Bénédict de Saussure. He published several scientific papers on meteorological subjects while in Paris in his late twenties. He took a teaching post in chemistry and developed some ideas for improving the distillation of wine into brandy, and, with his brother, successfully built a large distillery.

Illustration of the Argand lamp. This illustration appears in the book Les meirvelles de la science (1867-1869) by Louis Figuier.

The invention

During this period, in 1780, he started to invent improvements on the conventional oil lamp. The basic idea was to have a cylindrical wick which air could flow through and around, increasing the intensity of the light produced. A cylindrical chimney enhanced the air flow and a series of experiments gave the proportions for optimum operation. A mechanism for raising and lowering the wick allowed some adjustment and optimization as well. The light was much brighter than a candle (by a factor of five to ten), burned cleanly, and was cheaper than using candles.

In 1783, Argand met Etienne Montgolfier in France and became closely involved with his sensational experiments to devise a hot air balloon. When he was there, his acquaintance Antoine-Aroult Quinquet, to whom he had shown his an early prototype, began to manufacture the lamps himself, with minor change, and successfully fought a protracted legal battle for patent infringement.

Many problems attended the successful development of a lamp that could be a commercial success. Argand experimented with all of them, searching for practical compromises. The design manufacture of the wick was solved by a lacemaker. The type of glass to use next to the hot flame was a problem eventually solved. All available types of oil to use were tested, and methods to purify them for use were the subject of a number of experiments. Whale oil was eventually settled on, which eventually created an important new industry. The mechanism for holding the wick and moving it up and down went through many variations. Even the solder used to fabricate the oil reservoir was a problem when it was discovered that the soft solder joints leaked. The invention of the lamp did not consist, then, of only one invention, but rather of the improvement and development of a complete system of parts all working together, not unlike Edison's invention of the electrical lighting system that was to again revolutionize lighting over a century later.

In October of the same year, he determined to manufacture his lamp, in England. He eventually formed a partnership with William Parker and Matthew Boulton to manufacture the lamp. In 1784, he received a patent for his design. Argand also formed a close relationship with James Watt who performed some experiments on the lamps efficiency and advised him on waging his court battles.

The demand for the lamps was high, and the partners had many difficulties at first in manufacturing them, but they eventually became the standard source of illumination in homes and shops. Many imitators and improvers evolved new variations, and thousands of shops sprang up to produce them in the next decades. They were eventually displaced by the kerosene lamp in about 1850.

Later years

The invention of the lamp was not, in the end, profitable for Argand. He contracted malaria and suffered from it for twenty years before dying in Geneva at the age of 53.

External links

• The lamp [1]
• In light houses [2]