Fax Machines: The Office Magic Trick That Defied Explanation

Try explaining a fax machine to someone who has never used one. You put a piece of paper into a slot. You dial a phone number. The machine makes a noise that sounds like a dial-up modem having a minor crisis. And then — somehow — the paper appears at the other end, thousands of miles away, immediately, as if through some form of controlled teleportation. The paper you put in the machine is still in the machine. A copy has arrived elsewhere. This is approximately the explanation most fax machine users would have given in 1992, and it was both accurate and entirely unsatisfying as an account of what was actually happening.

The fax machine’s genius was that it worked in spite of this opacity. Nobody needed to understand it. You put the paper in, you dialled the number, it arrived. For about twenty years, that was enough.

How It Actually Worked (And Why Nobody Asked)

The correct explanation is somewhat more interesting than teleportation and significantly more tedious to explain at a party. A fax machine uses a scanner to read the document line by line, converting each line into a series of signals that represent light and dark areas — essentially, binary data. Those signals are then converted into audio tones, the same frequency range used for voice telephone calls, and transmitted over the telephone network exactly like a phone call. At the receiving end, another machine decodes the audio tones back into a facsimile — the word means “make similar” in Latin — of the original image, printing it line by line.

The technology that made this possible had existed in embryonic form since the 1840s. A Scottish clockmaker named Alexander Bain patented a concept for electric printing telegraphy in 1843, which is the conceptual ancestor of the fax. But the practical, office-ready fax machine didn’t arrive until the 1960s, when Xerox introduced the Long Distance Xerography — LDX — system, which could transmit a letter-sized page in about six minutes. The refinements that followed made it faster, cheaper, and eventually accessible to nearly every business that used a telephone.

By 1980, fax had become standard office infrastructure. By 1985, Japan alone had more than two million fax machines in use. By the early 1990s, the global installed base was in the tens of millions. The ITU — the International Telecommunication Union — standardised fax protocols in the 1970s and 1980s, which is why a machine made in Germany could communicate with a machine made in Japan without any configuration required. You just dialled.

The Paper That Curled and Faded

The dominant fax machine through the 1980s and into the 1990s used thermal paper — a thin, slightly waxy roll that responded to heat rather than ink. The print head was a row of tiny heating elements that activated in patterns corresponding to the received signal, darkening the thermal coating. No ink cartridges. No ribbons. Just heat.

The practical consequences of this technology were irritating in a specific, memorable way. Thermal paper curled. It curled as it came off the roll, and it continued curling after it was torn off, so that a received fax sat on your desk in a loosely wound tube rather than a flat sheet. The solution was to set a heavy object on it for a few minutes, or to actively bend it the other way, or to photocopy it immediately onto regular paper, which many offices did as a matter of policy because of the second problem: thermal paper faded.

The image on a thermal fax was not permanent. Exposure to heat, sunlight, or simply the passage of time caused the thermal coating to darken uniformly, gradually obscuring the printed image beneath. A fax stored in a warm filing cabinet for a year might be almost entirely illegible. A receipt printed on thermal paper and left on a car dashboard in summer would be blank within days. This made thermal fax records legally unreliable as archives, which is one reason many organisations routinely photocopied everything received.

Plain-paper fax machines, which used laser or inkjet technology to print received documents onto standard paper, began appearing in the early 1990s and cost significantly more. A mid-range thermal fax in 1992 might cost $200 to $300. A comparable plain-paper machine was $600 to $1,000. As prices fell through the decade, plain paper became standard. The curling and fading became a period detail, a characteristic of a transitional moment.

The Sound, the Handshake, the Screech

The noise a fax machine made was unavoidable and entirely distinctive. When you accidentally called a fax number with a regular phone, you were assaulted by a sustained electronic screech, a multi-tone shriek that was the machine on the other end announcing itself in fax protocol. It was the audio equivalent of walking into the wrong room at a party. You hung up immediately and tried to remember what number you had intended to dial.

Within the office, the fax machine’s sounds were more procedural: the beep as a received fax began, the slow mechanical whir of the paper advancing, the occasional chirp of a successful transmission confirmation. Unsuccessful transmissions printed an error sheet, tersely noting that the document had not been received and suggesting you try again. This was the first line in a conversation about whether the recipient’s machine was turned on, whether their paper had run out, whether the line was clear, whether you had the right number. Fax troubleshooting was an underappreciated skill of the era.

Junk Fax and the Broadcast Problem

The fax machine’s vulnerability was the same as its advantage: it was always on, always listening, always ready to receive. This made it effortlessly accessible to anyone who wanted to send you something, including, inevitably, people who wanted to sell you things you hadn’t asked about.

Junk fax was a significant problem through the 1990s. A single broadcast fax — transmitted simultaneously to thousands of numbers using auto-dialler equipment — cost the sender almost nothing, but it cost the recipient paper, toner, and phone line time. In 1991, the United States passed the Telephone Consumer Protection Act, which made unsolicited commercial fax advertising illegal. The problem persisted anyway, because enforcement was difficult and the economics heavily favoured the sender. Small businesses with busy fax lines would arrive in the morning to find the machine had spent the night receiving advertisements for office supplies, vacation packages, and long-distance phone services.

The junk fax problem was a preview of a dynamic that email would later amplify enormously — a communication channel that is open by design becomes a target for anyone who wants to broadcast commercial messages at scale.

Why Japan Never Let Go

The fax machine’s persistence in Japan, well into the 2010s and beyond, is genuinely puzzling to observers from countries where the technology effectively disappeared in the early 2000s. As of the mid-2020s, Japanese government ministries, hospitals, schools, and businesses still routinely send and receive faxes. The 2020 pandemic forced some reconsideration — fax-based reporting systems for COVID case counts were demonstrably slower than digital alternatives — but the transition has been remarkably gradual.

The reasons are partially structural: Japan’s handwritten signature culture, the formality associated with physical documents, the age profile of many businesses’ communication infrastructure. But they are also partly practical. Japanese is complex to input electronically — tens of thousands of kanji characters, multiple scripts, significant input friction — and handwriting on a fax requires no special software. The fax, for Japan, solved a real problem in a lasting way. That different problems existed elsewhere, and were solved differently, is a reminder that technology adoption is always local.

Medicine, Law, and the Persistence of the Analogue

Even in countries where fax machines have largely disappeared from daily business life, they have proven surprisingly resistant to replacement in specific professional domains. Healthcare and legal practice, in particular, continued using fax well past any rational technological justification.

The reasons were partly regulatory, partly habitual, and partly about the fax’s status as a known and accepted format for transmitting documents that carried legal or medical weight. A prescription faxed to a pharmacy had a legal standing that an email, for much of the relevant period, did not. A signed document faxed between law firms was an accepted practice that both parties understood and trusted. The technology was old, but the trust attached to it was institutional, and institutions change slowly.

There is also something genuine in the fax’s appeal for sensitive documents: it is point-to-point. It goes from one specific machine to one specific machine, over a dedicated connection. It does not pass through servers in unknown jurisdictions. It does not generate logs in the way email does. For certain applications, this narrowness is actually a virtue.

The Closest Thing to Magic

What the fax machine actually represented, beneath its curling thermal paper and its maddening screech, was the beginning of a new idea about information: that a physical object’s content could be separated from the object itself, transmitted as pure signal, and reconstituted elsewhere. This is, of course, exactly what the internet did and does, scaled by several orders of magnitude. The fax was a crude and limited early instance of a transformation that would eventually change everything.

For the people using it in 1988 or 1993, it was simply remarkable that you could send a signed contract from New York to Los Angeles in three minutes. The paper was still on your desk. The contract was also in Los Angeles. Both things were true simultaneously. In the pre-digital world, that genuinely felt like magic — an effect whose mechanism was invisible and whose usefulness was immediate. Most technology, at its best, achieves exactly that.