Fax

A fax machine sends pictures through a phone line.

First, the machine scans a paper. It turns the image into sounds. These sounds travel through the phone lines. The second machine hears the sounds. It turns them back into a picture. Then, it prints the paper.

Long ago, people used them to send news. Some people still use them today. Do you like sending pictures?

A fax machine sends images through a telephone line.

The name fax is short for facsimile. This word means an exact copy. First, the machine scans a paper document. It looks at the text and images. It turns the picture into a bitmap. A bitmap is a map of dots. The machine turns these dots into sounds. These sounds travel through the phone system.

The receiving machine hears the sounds. It turns the sounds back into a picture. Then, it prints a paper copy.

Early machines used a drum to scan. A light would hit the paper. The light changed into a sound. Modern machines are digital. They use data compression to work faster. This helps them send white or black areas quickly. Many people used fax machines in offices. Now, most people use the internet or email. But some places still use them. Doctors and police officers sometimes use fax machines. In Japan, many stores still have them. People there often like to use handwriting.

A fax machine is a tool used to send images and text over telephone lines.

The word fax is short for facsimile, which means an exact copy. This technology lets people send printed pages to a different location very quickly. It works by turning a physical document into signals that can travel through wires. Today, many people use the internet or email instead of faxing. However, some groups like doctors and law enforcement still use them. In Japan, fax machines are very common in convenience stores.

To understand how it works, we can look at the scanning step.

First, a machine scans the original document to see the text or images. It turns the contents into a bitmap, which is a map of dots. The machine then converts these dots into audio-frequency tones. These sounds travel through the telephone system to reach another machine.

The receiving machine listens to these tones and reconstructs the image. Finally, it prints a paper copy for the person to read. Modern digital machines use data compression to send large white or black areas even faster.

People have been working on ways to send images for a long time.

In 1846, an inventor named Alexander Bain reproduced graphic signs in a lab. He received a British patent in 1843 for his Electric Printing Telegraph. Later, Giovanni Caselli invented the Pantelegraph and started a service in 1865. In 1880, Shelford Bidwell made a machine that could scan any two-dimensional image. Elisha Gray also invented the telautograph in 1888 to send signatures over long distances. These early steps helped lead to the machines we use today.

Technology changed a lot during the 20th century with new inventions.

In 1924, scientists at AT&T sent 15 photographs from Cleveland to New York City. That same year, Richard H. Ranger invented a way to send photos through the air using radio. Herbert E. Ives also sent the first color facsimile in 1924 using red, green, and blue colors. In 1964, the Xerox Corporation introduced a version of the modern fax machine. Later, the Dacom company built the first digital fax machine to work in under a minute. These milestones made faxing much faster and easier for everyone to use.

Fax machines changed how businesses and homes shared information.

In the 1980s and 1990s, these machines were found in almost every office. Some machines even used special thermal paper that came in rolls. Other models used inkjet or laser printing to make the copies. Even though the internet is now very popular, the fax is still around. It is used for important legal papers and even weather charts for ships. It shows how one clever idea can change the world for many years.

Faxing, or facsimile transmission, is the process of sending scanned printed material over telephone lines.

This technology allows for the telephonic transmission of both text and images to a remote printer or output device. The term "facsimile" essentially means an exact copy of an original document. While many people now use Internet-based tools like email, fax machines remain important in specific professional fields. For example, they are still utilized in some medical administration and law enforcement settings. In some countries, faxed contracts are legally recognized because they include copies of physical signatures.

The mechanism of a fax machine involves several precise steps to move an image through a wire.

First, a machine scans the original document to process its contents as a single fixed graphic image. This process converts the text or images into a bitmap, which is a map of dots. In older analog systems, the machine performed a direct conversion of image darkness into audio-frequency tones. These tones were transmitted through the telephone system using an acoustic coupler, which connected a speaker to a telephone handset.

Modern digital machines use data compression to speed up the process. This allows the machine to transmit large areas of pure white or pure black much more quickly.

Different types of fax technology have evolved significantly over time. Early analog machines often used optical scanning where a document spun on a drum. The reflected light intensity was measured by a photocell to control a tone generator. This generator, or modulator, created the audio tones used for transmission. Later, digital fax machines emerged to provide much faster service. These machines use digital representations of the page rather than continuous analog signals. Some modern hybrid machines also combine faxing with copier technology to scan, copy, and fax in one unit.

The history of facsimile technology spans nearly two centuries of invention.

In 1846, Scottish inventor Alexander Bain reproduced graphic signs in laboratory experiments. He had previously received a British patent in 1843 for his "Electric Printing Telegraph." Following this, Frederick Bakewell improved Bain's design and demonstrated a telefax machine. In 1858, Giovanni Caselli invented the Pantelegraph and launched a commercial service between Paris and Lyon in 1865. By 1880, Shelford Bidwell constructed the scanning phototelegraph, which was the first machine to scan any two-dimensional original without manual plotting.

Significant milestones in the 20th century moved the technology toward widespread use.

In 1924, scientists at the AT&T Corporation successfully sent 15 photographs by telephone from Cleveland to New York City. That same year, Herbert E. Ives transmitted the first color facsimile using red, green, and blue color separations. In 1964, the Xerox Corporation introduced the (LDX), or Long Distance Xerography, which is considered a precursor to the modern fax. By 1966, Xerox released the Magnafax Telecopiers, a smaller unit that could transmit a letter-sized document in about six minutes. Eventually, Dacom developed the first sub-minute digital fax machine using data compression technology.

Fax machines reached a peak of popularity during the 1980s and 1990s.

During this era, they became ubiquitous in almost every office environment. The industry saw a move toward interoperability through international standards. In 1976, the CCITT Recommendation T.3 allowed different Group 2 machines to work together. By 1980, the T.4 recommendation promised even faster digital transmissions of just 40 seconds per page. This standardization led to a massive wave of compact and efficient machines hitting the global market.

Despite the rise of the World Wide Web, faxing maintains unique cultural and practical roles.

In Japan, fax machines are used extensively because of a widespread preference for handwriting over typing. They are so common that they are available in over 81% of all convenience stores nationwide. However, the reliance on faxing has also caused challenges. During the COVID-19 pandemic, some countries like Germany and the United States experienced delays in reporting data. In some German districts, health departments used only fax machines, which led to errors in reporting infection numbers. This highlights how even old technology can impact modern systems of communication.