From Sundials to Smartwatches: The Digital Revolution on our Wrists
Contents
<p>In April 1972, a full-page advertisement in the Wall Street Journal offered readers a wristwatch that cost $2,100 — more than a new Ford Pinto and $150 more than a top-of-the-range Rolex. It was called the Pulsar Time Computer, it had no hands, and to read the time you pressed a button and a cluster of red light-emitting diodes glowed for a couple of seconds before switching off to save the battery. Hamilton made 400 of the 18-carat gold examples and sold out in three days. That awkward, power-hungry, absurdly expensive gadget is the ancestor of the slab of glass and silicon most of us now strap on without thinking. The route from a shadow on a stone dial to a computer that measures your heartbeat is stranger and more human than the smooth marketing story suggests.</p>
<h2 id="before-the-wrist-shadows-water-and-springs">Before the wrist: shadows, water and springs</h2><div class="ad-unit ad-in-article" aria-label="Advertisement">
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<p>The oldest timekeepers had no moving parts at all. Egyptian obelisks and shadow clocks divided daylight by the sun’s angle from at least the second millennium BCE, and the sundial they inspired stayed the standard instrument of civil timekeeping for thousands of years, useless only at night or under cloud. Water clocks, or clepsydrae, filled that gap — the Greek engineer Ctesibius of Alexandria built remarkably accurate float-and-gear versions in the third century BCE. What none of these had was portability. A sundial is bolted to the ground and reads the sky; you cannot pocket the sky.</p>
<p>The breakthrough that eventually made a watch possible was the mainspring — a coiled ribbon of steel that stores energy and releases it steadily, so a clock no longer needed a hanging weight and gravity to run. That freed the mechanism from the wall. The German locksmith Peter Henlein, working in Nuremberg in the early sixteenth century, is the name most often attached to the first genuinely portable spring-driven clocks: drum-shaped brass devices, a few inches across, worn on a chain around the neck or hung from a belt. They were ornaments as much as instruments, wildly inaccurate by modern standards, but they moved with their owner. That is the conceptual leap. Everything after Henlein is refinement.</p>
<h2 id="history-from-the-pocket-to-the-wrist">History: from the pocket to the wrist</h2>
<p>For three centuries the portable clock lived in a pocket. The wristwatch was, for a long time, regarded as a woman’s ornament — men wore fob watches on a chain and considered anything on the wrist faintly effeminate. War changed that. Officers coordinating artillery and infantry movements in the Anglo-Boer War and then, decisively, in the trenches of the First World War needed to check the time without fumbling in a pocket while holding a rifle or a map. Synchronising an attack to the minute is far easier with the dial already facing you. The “trench watch” — a small pocket movement fitted with wire lugs and a leather strap — turned the wristwatch from jewellery into standard kit, and men kept wearing them after 1918.</p>
<p>The mechanical wristwatch then had a long, elegant middle age until electronics arrived. The Pulsar of 1972 was the shock — the first all-electronic digital watch and the first to use an LED display, developed jointly by Hamilton and Electro/Data. It was a technological flex more than a practical tool; those LEDs drained the battery so fast the time could not stay lit. Japanese firms answered with the far more sensible liquid-crystal display, which sipped power and could show the time continuously, and by the late 1970s Casio and Seiko had turned the digital watch from a luxury into something a schoolchild could own. The stage was set for the watch to stop merely telling the time and start doing other things.</p>
<h2 id="the-long-road-to-smart">The long road to “smart”</h2><div class="ad-unit ad-in-article" aria-label="Advertisement">
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<p>The idea of a watch that computes did not begin with Silicon Valley. Seiko sold the Data-2000 in 1983, a watch that stored notes typed on a tiny attached keyboard, and through the 1980s wrist calculators, wrist televisions and wrist databanks came and mostly went. The interesting failures teach as much as the successes. In 2002 Microsoft launched SPOT — Smart Personal Objects Technology — which beamed weather, news and traffic to watches over a repurposed FM radio network. It was genuinely clever and comprehensively ignored; the service was shut down in 2012. Like other ambitious projects that arrive before their moment, SPOT was less a mistake than a rehearsal, in the way that ideas can wait years for the world to be ready — a pattern visible everywhere from politics to physics, whether in the slow build of the <a href="/story/october-revolution/">October Revolution</a> or the decades-long chase after <a href="/story/the-elusive-dream-room-temperature-superconductors-and-the-quest-for-energy-efficiency/">room-temperature superconductors</a>.</p>
<p>What SPOT lacked was the ecosystem that made a modern smartwatch worthwhile: a smartphone in every pocket to do the heavy lifting, and wireless bandwidth to link the two. Pebble, a Kickstarter project that shipped in 2013, proved the appetite existed — its e-paper display, week-long battery and open developer platform sold in the hundreds of thousands. Then in April 2015 Apple shipped the Apple Watch, and the category tipped from enthusiast curiosity to mass market almost overnight. Samsung, Fitbit and Garmin filled in the rest of the landscape, each pulling the device toward a different purpose.</p>
<h2 id="why-the-smartwatch-mattered">Why the smartwatch mattered</h2>
<p>The important shift was not that the watch got clever but that it got intimate. A phone lives in a pocket or a bag; a watch sits against the skin, all day and often all night, which makes it a uniquely good place to put a sensor. That is why the smartwatch’s centre of gravity moved from notifications toward health. An optical heart-rate monitor, an accelerometer and, on some models, a single-lead electrocardiogram turned a gadget into something closer to a medical instrument. The Apple Watch’s irregular-rhythm notification has documented cases of prompting people to seek care for atrial fibrillation they did not know they had; fall detection has summoned help for people who could not reach a phone. That is a genuine change in what a wrist device is for, and it is why the smartwatch stuck where the wrist television did not.</p>
<h2 id="how-it-is-worn-and-where">How it is worn, and where</h2>
<p>The smartwatch is not one object but several, sorted by what its owner wants. In Cupertino and the wider Apple ecosystem the watch is a fashion-and-health accessory paired to an iPhone. Garmin built its following among runners, cyclists and pilots who want multi-day battery life and GPS accuracy over app breadth. Fitbit, before and after Google bought it, aimed squarely at sleep and step tracking for people who never wanted a computer on their wrist at all. In parts of Asia the watch doubles as a contactless wallet far more routinely than in Europe, where the phone still dominates payments. The same slab of glass means different things in different hands.</p>
<h2 id="what-the-watch-still-carries">What the watch still carries</h2>
<p>Even the most sensor-laden smartwatch keeps a surprising amount of inherited symbolism. The round face on many Android models is a deliberate echo of the mechanical dial, kept for no functional reason — a rectangle uses the screen better — but because a watch is supposed to look like a watch. The “complications” on a smartwatch face borrow their name directly from horology, where any function beyond telling the hours was called a complication. Even the winding crown survives on the Apple Watch as a scroll wheel, a vestigial organ from the age of the mainspring. We are still, in small ways, wearing Peter Henlein’s neck clock.</p>
<h2 id="fun-facts">Fun facts</h2>
<ul>
<li>The Pulsar’s LED display drew so much power that continuous timekeeping was impossible — you physically pressed a button to see the time, and a two-second glow was all the battery would allow.</li>
<li>The wristwatch was long dismissed as a lady’s trinket; it took the coordination demands of trench warfare in 1914–18 to make it acceptable on a man’s wrist.</li>
<li>Microsoft’s SPOT watches received data over leased FM radio subcarriers — the same broadcast infrastructure that carries your local radio station — years before Bluetooth made wrist connectivity routine.</li>
<li>Pebble began life as a crowdfunding campaign in 2012 that raised over $10 million, at the time the most-funded Kickstarter project ever, proving demand existed before any giant entered the market.</li>
<li>The word “complication” on a smartwatch face is borrowed straight from traditional watchmaking, where it meant any feature beyond the plain display of hours and minutes.</li>
</ul>
<h2 id="closing-reflection">Closing reflection</h2>
<p>There is a quiet irony in the arc from sundial to smartwatch. The earliest timekeepers read the largest thing available — the turning sky — and asked nothing of their owner. The newest ones read the smallest and most private thing available — the pulse in your wrist, the tremor of a stumble, the rhythm of your sleep — and report it back. Along the way the instrument stopped pointing outward at the universe and started pointing inward at the person wearing it. Whether that makes us better informed or merely more monitored is a question the technology cannot answer; it only keeps better time while we decide.</p>
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