Skip to main content

1879: Let There Be Light

1879: Let There Be Light

125 Years Ago

At 9:00 a.m. on October 22, Charles Batchelor, a researcher in Thomas Edison’s “invention factory” in Menlo Park, New Jersey, sat down to record the results of the previous day’s work. “We made some very interesting experiments on straight carbons made from cotton thread … ,” he began. The results were interesting indeed. Earlier that month, after more than a year of frustrating efforts trying to make an incandescent light with platinum wire, Edison and his colleagues had struck out in a different direction, using filaments made of carbon instead. That had proved to be the key decision in the invention of Edison’s light bulb.

The experiments of October 21 yielded the first truly promising results for the weary lab workers. Most notably, when a filament made of ordinary thread was carbonized and hooked up to an electrical circuit, it glowed from 1:30 a.m. to 3:00 p.m. After the power was increased, it shone even brighter for another hour before finally breaking. Here was the first clear evidence that Edison and his men were on the right track, and they worked eagerly to improve and refine their design. By the end of the year, they had the technology well enough under control to make a grand public demonstration with more than 50 shining bulbs.

Little of what went into Edison’s electric light was completely new. Researchers had been trying to make incandescent lights since 1820, mostly with spirals of thin platinum wire, which was chosen for its high melting point. In 1860 the British scientist Joseph Swan patented an incandescent lamp with a carbonized paper filament, and by the late 1870s he, too, was getting excellent results with carbonized cotton thread.

Still, there was enough novelty in Edison’s design to justify a patent, which he quickly took out. Until it expired, he dominated the American market for electric lighting, supplying about 75 percent of the nation’s bulbs along with, in many cases, the power to light them. Swan controlled most of Britain’s electric-lighting business until his company and Edison’s British subsidiary merged in 1883. Edison rolled up 1,093 patents before he was finished inventing, while Swan, who had previously invented the dry photographic plate, did not do badly either, developing a process for making artificial fibers that remains in use in the textile industry to this day.

We hope you enjoy our work.

Please support this 72-year tradition of trusted historical writing and the volunteers that sustain it with a donation to American Heritage.


Featured Articles

Famous writers including Emerson, Thoreau, Hawthorne, and the Alcotts turned Sleepy Hollow Cemetery into our country’s first conservation project.

Native American peoples and the lands they possessed loomed large for Washington, from his first trips westward as a surveyor to his years as President.

In his Second Inaugural Address, Abraham Lincoln embodied leading in a time of polarization, political disagreement, and differing understandings of reality.

A hundred years ago, America was rocked by riots, repression, and racial violence.

During Pres. Washington’s first term, an epidemic killed one tenth of all the inhabitants of Philadelphia, then the capital of the young United States.

Now a popular state park, the unassuming geological feature along the Illinois River has served as the site of centuries of human habitation and discovery.  

The recent discovery of the hull of the battleship Nevada recalls her dramatic action at Pearl Harbor and ultimate revenge on D-Day as the first ship to fire on the Nazis.

Our research reveals that 19 artworks in the U.S. Capitol honor men who were Confederate officers or officials. What many of them said, and did, is truly despicable.

Here is probably the most wide-ranging look at Presidential misbehavior ever published in a magazine.

When Germany unleashed its blitzkreig in 1939, the U.S. Army was only the 17th largest in the world. FDR and Marshall had to build a fighting force able to take on the Nazis, against the wishes of many in Congress.

Roast pig, boiled rockfish, and apple pie were among the dishes George and Martha enjoyed during the holiday in 1797. Here are some actual recipes.

Born during Jim Crow, Belle da Costa Greene perfected the art of "passing" while working for one of the most powerful men in America.