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Tuesday, January 18, 2011

Invention of the traffic signal..Garrett Morgan the multifaceted Inventor.

Garrett Morgan was an inventor and businessman from Cleveland who is best known for inventing a device called the Morgan safety hood and smoke protector in 1914.

Garrett Morgan - Biography

The son of former slaves, Garrett Morgan was born in Paris, Kentucky on March 4, 1877. His early childhood was spent attending school and working on the family farm with his brothers and sisters. While still a teenager, he left Kentucky and moved north to Cincinnati, Ohio in search of opportunity. Although Garrett Morgan's formal education never took him beyond elementary school, he hired a tutor while living in Cincinnati and continued his studies in English grammar. In 1895, Morgan moved to Cleveland, Ohio, where he went to work as a sewing machine repair man for a clothing manufacturer. News of his proficiency for fixing things and experimenting traveled fast and led to numerous job offers from various manufacturing firms in the Cleveland area.
In 1907, the inventor opened his own sewing equipment and repair shop. It was the first of several businesses he would establish. In 1909, he expanded the enterprise to include a tailoring shop that employed 32 employees. The new company turned out coats, suits and dresses, all sewn with equipment that Garrett Morgan himself had made.
In 1920, Garrett Morgan moved into the newspaper business when he established the Cleveland Call. As the years went on, he became a prosperous and widely respected business man, and he was able to purchase a home and an automobile. Indeed it was Morgan's experience while driving along the streets of Cleveland that inspired him to invent an improvement to traffic signals.

Gas Mask

On July 25, 1916, Garrett Morgan made national news for using his gas mask to rescue 32 men trapped during an explosion in an underground tunnel 250 feet beneath Lake Erie. Morgan and a team of volunteers donned the new "gas masks" and went to the rescue. After the rescue, Morgan's company received requests from fire departments around the country who wished to purchase the new masks. The Morgan gas mask was later refined for use by U.S. Army during World War I. In 1914, Garrett Morgan was awarded a patent for a Safety Hood and Smoke Protector. Two years later, a refined model of his early gas mask won a gold medal at the International Exposition of Sanitation and Safety, and another gold medal from the International Association of Fire Chiefs.

The Morgan Traffic Signal

The first American-made automobiles were introduced to U.S. consumers shortly before the turn of the century. The Ford Motor Company was founded in 1903 and with it American consumers began to discover the adventures of the open road. In the early years of the 20th century it was not uncommon for bicycles, animal-powered wagons, and new gasoline-powered motor vehicles to share the same streets and roadways with pedestrians. Accidents were frequent. After witnessing a collision between an automobile and a horse-drawn carriage, Garrett Morgan took his turn at inventing a traffic signal. Other inventors had experimented with, marketed, and even patented traffic signals, however, Garrett Morgan was one of the first to apply for and acquire a U.S. patent for an inexpensive to produce traffic signal. The patent was granted on November 20, 1923. Garrett Morgan also had his invention patented in Great Britain and Canada. Garrett Morgan stated in his patent for the traffic signal, "This invention relates to traffic signals, and particularly to those which are adapted to be positioned adjacent the intersection of two or more streets and are manually operable for directing the flow of traffic... In addition, my invention contemplates the provision of a signal which may be readily and cheaply manufactured." The Morgan traffic signal was a T-shaped pole unit that featured three positions: Stop, Go and an all-directional stop position. This "third position" halted traffic in all directions to allow pedestrians to cross streets more safely.
Garrett Morgan's hand-cranked semaphore traffic management device was in use throughout North America until all manual traffic signals were replaced by the automatic red, yellow, and green-light traffic signals currently used around the world. The inventor sold the rights to his traffic signal to the General Electric Corporation for $40,000. Shortly before his death in 1963, Garrett Morgan was awarded a citation for his traffic signal by the United States Government.

Other Inventions

Garrett Morgan was constantly experimenting to develop new concepts. Though the traffic signal came at the height of his career and became one of his most renowned inventions, it was just one of several innovations he developed, manufactured, and sold over the years. Morgan invented a zig-zag stitching attachment for manually operated sewing machine. He also founded a company that made personal grooming products, such as hair dying ointments and the curved-tooth pressing comb.
As word of Garrett Morgan's life-saving inventions spread across North America and England, demand for these products grew. He was frequently invited to conventions and public exhibitions to demonstrate how his inventions worked.
Garrett Morgan died on August 27, 1963, at the age of 86. His life was long and full, and his creative energies have given us a marvelous and lasting legacy.

History of Lighting.

History of Lighting
parts of a lightbulb
1809 - Humphry Davy, an English chemist, invented the first electric light. Davy connected two wires to a battery and attached a charcoal strip betwween the other ends of the wires. The charged carbon glowed making the first arc lamp.


1820 - Warren De la Rue enclosed a platinum coil in an evacuated tube and passed an electric current through it. His lamp design was worked but the cost of the precious metal platinum made this an impossible invention for wide-spread use.

1835 - James Bowman Lindsay demonstrated constant electric lighting system using a prototype lightbulb.


1850 - Edward Shepard invented an electrical incandescent arc lamp using a charcoal filament. Joseph Wilson Swan started working with carbonized paper filaments the same year.

1854 - Henricg Globel, a German watchmaker, invented the first true lightbulb. He used a carbonized bamboo filament placed inside a glass bulb.

1875 - Herman Sprengel invented the mercury vacuum pump making it possible to develop a practical electric light bulb. Making a really good vacuum inside the bulb possible.
1875 - Henry Woodward and Matthew Evans patented a lightbulb.


1878 - Sir Joseph Wilson Swan (1828-1914), an English physicist, was the first person to invent a practical and longer-lasting electic lightbulb (13.5 hours). Swan used a carbon fiber filament derived from cotton.

1879 - Thomas Alva Edison invented a carbon filament that burned for forty hours. Edison placed his filament in an oxygenless bulb. (Edison evolved his designs for the lightbulb based on the 1875 patent he purchased from inventors, Henry Woodward and Matthew Evans.)

1880 - Edison continued to improved his lightbulb until it could last for over 1200 hours using a bamboo-derived filament.

1903 - Willis Whitnew invented a filament that would not make the inside of a lightbulb turn dark. It was a metal-coated carbon filament (a predecessor to the tungsten filament).

1906 - The General Electric Company were the first to patent a method of making tungsten filaments for use in incandesent lightbulbs. The filaments were costly.

1910 - William David Coolidge (1873-1975) invented an improved method of making tungsten filaments. The tungsten filament outlasted all other types of filaments and Coolidge made the costs practical.

1925 - The first frosted lightbulbs were produced.

1991 - Philips invented a lightbulb that lasts 60,000 hours. The bulb uses magnetic induction.