Mobile phone

                                                                                                                      April 3, 2003 marked the 30th anniversary of the first public telephone call placed on a portable cellular phone. Martin Cooper ( now chairman, CEO, and co-founder of ArrayComm Inc) placed that call on April 3, 1973, while general manager of Motorola's Communications Systems Division. It was the incarnation of his vision for personal wireless communications, distinct from cellular car phones. That first call, placed to Cooper's rival at AT&T's Bell Labs from the streets of New York City, caused a fundamental technology and communications market shift toward the person and away from the place.

"People want to talk to other people - not a house, or an office, or a car. Given a choice, people will demand the freedom to communicate wherever they are, unfettered by the infamous copper wire. It is that freedom we sought to vividly demonstrate in 1973," said Martin Cooper.

Martin Cooperadded, "As I walked down the street while talking on the phone, sophisticated New Yorkers gaped at the sight of someone actually moving around while making a phone call. Remember that in 1973, there weren't cordless telephones, let alone cellular phones. I made numerous calls, including one where I crossed the street while talking to a New York radio reporter - probably one of the more dangerous things I have ever done in my life."

Following the April 3, 1973, public demonstration, using a "brick"-like 30-ounce phone, Cooper started the 10-year process of bringing the portable cell phone to market. Motorola introduced the 16-ounce "DynaTAC" phone into commercial service in 1983, with each phone costing the consumer $3,500. It took seven additional years before there were a million subscribers in the United States. Today, there are more cellular subscribers than wireline phone subscribers in the world, with mobile phones weighing as little as 3 ounces.

Martin Cooper Today

Martin Cooper's role in conceiving and developing the first portable cellular phone directly impacted his choice to found and lead Array-comm, a wireless technology and systems company founded in 1992. ArrayComm's core adaptive antenna technology increases the capacity and coverage of any cellular system, while significantly lowering costs and making speech more reliable. This technology addresses what Cooper calls "the unfulfilled promise" of cellular, which should be, but still isn't as reliable or affordable as wired telephony.

Array-comm has also used its adaptive antenna technology to make the Internet "personal" by creating the i-BURST Personal Broadband System, which delivers high-speed, mobile Internet access that consumers can afford.

"It's very exciting to be part of a movement toward making broadband available to people with the same freedom to be anywhere that they have for voice communications today," said Martin Cooper. "People rely heavily on the Internet for their work, entertainment and communication, but they need to be unleashed. We will look back at 2003 as the beginning of the era when the Internet became truly untethered."

parachute

Credit for the invention of the first practical parachute frequently goes to Sebastien Lenormand who demonstrated the parachute principle in 1783. However, parachutes had been imagined and sketched by Leonardo Da Vinci (1452-1519) centuries earlier.

Faust Vrancic - Homo Volans

Other early inventors designed parachutes, including Croatian Faust Vrancic who constructed a device based on Da Vinci's drawing. Faust Vrancic jumped from a Venice tower in 1617 wearing a rigid-framed parachute. Faust Vrancic published Machinae Novae, in which he describes in text and picture fifty-six advanced technical constructions, including Vrancic's parachute called the Homo Volans.

Jean Pierre Blanchard - Animal Parachute

Jean Pierre Blanchard (1753-1809) a Frenchman was probably the first person to actually use a parachute for an emergency. In 1785, he dropped a dog in a basket, to which a parachute was attached, from a balloon high in the air.

First Soft Parachute

In 1793, Blanchard claims to have escaped from an exploded hot air balloon with a parachute. However, this was an unwitnessed event. Blanchard, it should be noted, did develop the first foldable parachute made from silk, up until that point all parachutes were made with rigid frames.

electricity and light

Electricity and Lightbulb - History
Thomas Edison's greatest challenge was the development of a practical incandescent, electric light. Contrary to popular belief, he didn't "invent" the lightbulb, but rather he improved upon a 50-year-old idea. In 1879, using lower current electricity, a small carbonized filament, and an improved vacuum inside the globe, he was able to produce a reliable, long-lasting source of light. The idea of electric lighting was not new, and a number of people had worked on, and even developed forms of electric lighting. But up to that time, nothing had been developed that was remotely practical for home use. Edison's eventual achievement was inventing not just an incandescent electric light, but also an electric lighting system that contained all the elements necessary to make the incandescent light practical, safe, and economical. After one and a half years of work, success was achieved when an incandescent lamp with a filament of carbonized sewing thread burned for thirteen and a half hours.

There are a couple of other interesting things about the invention of the light bulb: While most of the attention was on the discovery of the right kind of filament that would work, Edison actually had to invent a total of seven system elements that were critical to the practical application of electric lights as an alternative to the gas lights that were prevalent in that day.

These were the development of:

1. the parallel circuit,
2. a durable light bulb,
3. an improved dynamo,
4. the underground conductor network,
5. the devices for maintaining constant voltage,
6. safety fuses and insulating materials, and
7. light sockets with on-off switches.

Before Edison could make his millions, every one of these elements had to be invented and then, through careful trial and error, developed into practical, reproducible components. The first public demonstration of the Thomas Edison's incandescent lighting system was in December 1879, when the Menlo Park laboratory complex was electrically lighted. Edison spent the next several years creating the electric industry.

The modern electric utility industry began in the 1880s. It evolved from gas and electric carbon-arc commercial and street lighting systems. On September 4, 1882, the first commercial power station, located on Pearl Street in lower Manhattan, went into operation providing light and electricity power to customers in a one square mile area; the electric age had begun. Thomas Edison's Pearl Street electricity generating station introduced four key elements of a modern electric utility system. It featured reliable central generation, efficient distribution, a successful end use (in 1882, the light bulb), and a competitive price. A model of efficiency for its time, Pearl Street used one-third the fuel of its predecessors, burning about 10 pounds of coal per kilowatt hour, a "heat rate" equivalent of about 138,000 Btu per kilowatt hour. Initially the Pearl Street utility served 59 customers for about 24 cents per kilowatt hour. In the late 1880s, power demand for electric motors brought the industry from mainly nighttime lighting to 24-hour service and dramatically raised electricity demand for transportation and industry needs. By the end of the 1880s, small central stations dotted many U.S. cities; each was limited to a few blocks area because of transmission inefficiencies of direct current (dc).

The success of his electric light brought Thomas Edison to new heights of fame and wealth, as electricity spread around the world. His various electric companies continued to grow until in 1889 they were brought together to form Edison General Electric. Despite the use of Edison in the company title however, he never controlled this company. The tremendous amount of capital needed to develop the incandescent lighting industry had necessitated the involvement of investment bankers such as J.P. Morgan. When Edison General Electric merged with its leading competitor Thompson-Houston in 1892, Edison was dropped from the name, and the company became simply General Electric.

Aeroplane

The inventors of the first airplane were Orville and Wilbur Wright. On December 17, 1903, the Wright brothers made the first successful experiment in which a machine (aka airplane) carrying a man rose by its own power, flew naturally and at even speed, and descended without damage.

What is an Airplane?

Most of us only have to look up into the sky to see an airplane, and many of us have traveled by airplane to places that would have taken much longer by any other means of transportation. An airplane by definition is an aircraft that has a fixed wing and is powered by propellers or jets.

Before the Wright Brothers - History of Flight

However, before the first airplane was invented by the Wright Brothers, inventors made numerous attempts to make like the birds and fly. These early inventions included kites, hot air balloons, airships, gliders, and other devices.