The Waiting Glass

I — The Accident

Don Stookey was trying to make a photograph out of glass.

The material was called FotoForm, and the idea behind it is still lovely: a photosensitive glass you could expose like film and then develop, so that the image wasn't printed on the surface but hung suspended inside the sheet, permanently, like something caught in ice. On a day in 1952 Stookey slid a plate of it into a furnace to be heat-treated at six hundred degrees, closed the door, and went off to do something else.

The controller failed.

Nobody noticed for hours. By the time anyone looked, the plate had been sitting at nine hundred degrees — three hundred past where it was supposed to be — which meant it wasn't a plate any more. Glass at nine hundred degrees runs like syrup. It would have poured out of its holder, spread across the floor of the furnace and fused itself to the lining, and somebody was going to lose a day chipping the mess out with a chisel.

Stookey opened the door, expecting exactly that.

Inside was a milky white plate, still intact.

He reached in with the tongs, and the plate slipped, and it hit the floor.

It didn't shatter. It bounced.

What he had made by accident that afternoon was the first synthetic glass-ceramic. Corning called it Pyroceram and sold it as CorningWare, and within a decade it was in more or less every kitchen in America. But the casserole dish was never really the point. The point was the sound it made on the floor — the discovery that glass, the most reliably brittle substance in industrial life, could be talked into behaving like something else entirely.

II — The Company

It is worth pausing on where this happened, because it explains a great deal about what comes later.

Corning had been in the glass business since 1851, and in the town of Corning, New York since 1868 — a small place in the Finger Lakes that the company more or less is. The Houghton family who ran it worked out early that in a crowded trade full of people making bottles and windows, the way to stand apart was to know more about the material than anyone else. So they hired scientists. This was an unusual thing for a glassworks to do in the nineteenth century, and it turned out to be the whole strategy.

In 1879 a man came to them with an awkward request. He needed a very particular kind of small glass envelope, thin and even and able to survive being sealed around a filament that would run white-hot for hours. Nobody was making anything like it. Corning worked out how, and by 1880 Thomas Edison had made them his sole supplier — which is to say that when the electric light spread across the world, it spread inside glass blown in upstate New York. By 1926 an engineer named William Woods had built them a machine that turned out bulb blanks in a continuous ribbon, hundreds a minute, faster than any human hand could approach.

There was a pattern in all of this that the company seems to have half-understood about itself. In the early 1900s two Corning scientists, William Churchill and George Hollister, developed a glass that could take violent changes in temperature without cracking. The application was railway signal lanterns — a hot lamp in a cold rainstorm, and a shattered lens meant a signal with no colour in it, which meant a train running blind. Useful, unglamorous, life-and-death. And then a few years later somebody's wife asked whether that same glass might do for a baking dish, and Corning had invented Pyrex without setting out to.

That happened again and again. They cast the two-hundred-inch mirror for the Palomar telescope in the thirties, a disc so large it took most of a year to cool. They made the glass for the cathode ray tube, and by the sixties essentially every television screen on the planet was theirs. In 1970 they made the first optical fibre clear enough to carry a signal for miles, years before anybody had built a network that needed one.

So the house style, if you can call it that, was to make the material first and wait for the world to catch up. Sometimes the wait was a few years. Sometimes it was longer. And a company that thinks this way inevitably accumulates a peculiar kind of inventory: not unsold stock, but unused answers — things that work beautifully and have nowhere to go.

The one this story is about waited thirty-six years.

III — Project Muscle

Stookey's bouncing plate raised an obvious question. Could you get that toughness without turning the glass milky — could ordinary clear glass be persuaded to refuse to break? The programme they set up to find out was called Project Muscle, which tells you something about the mood of the place.

The answer came in 1962, and it was chemical rather than thermal.

Glass doesn't break because it's weak. It breaks because its surface is covered in flaws too small to see, and a flaw only ever has to be pulled open once. So the trick isn't to make the glass harder — it's to squeeze it.

Put aluminium oxide into the melt. Then take the finished sheet and lower it into a bath of hot potassium salt. The glass has sodium atoms sitting in its structure, and the bath is full of potassium atoms, which are alike in every way that matters except that they're bigger. At temperature the two trade places: the big ones move in where the small ones had been. And when the sheet cools, its surface is left holding more than it has room for, and it stays that way. Permanently crushed inward. Every invisible flaw pressed shut by the material around it.

The composition got an internal designation: 0317.

It took a hundred thousand pounds per square inch of force — something like fourteen times ordinary glass. Corning marketed it as Chemcor, and then spent the better part of nine years looking for anybody at all who wanted it.

The sales list makes slightly sad reading. Phone booths. Prison windows. Safety eyeglasses, which were recalled — because a glass that holds and holds and finally breaks does not break politely. It goes all at once, everywhere. Some of it did reach the road: a run of American Motors Javelins carried Chemcor windshields, and around a hundred drag-racing Darts and Barracudas took it, not because it was tough but because it could be made thin, and thin glass is light glass, and over a quarter mile weight is the only enemy there is.

Then they put it on the crash sled, and found the problem they could not engineer their way out of.

The windshields didn't break. That sounds like a triumph and it was the opposite of one. A windshield that gives way slows a head down on its way through; a windshield that holds doesn't slow it at all — it simply stops it. They had built something too strong to be survivable. Ford wasn't interested. In the end nobody was.

In 1971 they closed Project Muscle, filed the results, and 0317 went into the dark for the next thirty-four years.

IV — The Scratch

What eventually woke it up was a flip phone.

In 2005 Motorola shipped the Razr V3, and the small external display on the lid — the little window that showed you the time with the phone still shut — sat behind glass rather than plastic. Somebody at Corning noticed. It was a scrap of a thing, an inch or so across. But it meant that for the first time in a generation, a consumer electronics company had decided a screen was worth putting glass in front of.

A small team went back to the question of how thin 0317 could go. The surviving samples were around four millimetres; they thought they could do a great deal better. A market study suggested there might be real money in it, and someone gave the project a name that stuck: Gorilla Glass.

Eighteen months later it had gone precisely nowhere, and for the same reason it had gone nowhere in 1971. No handset maker was going to specify a glass that nobody was manufacturing, and Corning was not going to convert a production line to manufacture a glass that nobody had specified. Everybody waited politely for somebody else to move. The samples went back on the shelf and the team went back to other work.

And then, three thousand miles west, a man took a telephone out of his pocket at the end of the day and didn't put it down.

He was in the black mock turtleneck and the jeans. He took off the rimless glasses and held the thing up close to the lamp instead, turning it slowly. His keys had been in the pocket with it, which was rather the point — six weeks of carrying the prototype against coins and keys and the seam of his own trousers, because that is how the object was actually going to live in the world.

The face of it was ruined. Not cracked; something quieter and worse than cracked. A fine grey web of scratches, too shallow to catch a thumbnail on, invisible from any angle in a dark room. Then the screen woke, and the light coming up from underneath caught in all of them at once, and the whole surface went soft and grey and cheap.

The screen was plastic. So was every screen on sale in America — Motorola, Nokia, Palm, every handset in every carrier store in the country — for one very good reason, which is that phones get dropped, and plastic survives being dropped, and glass is the thing a phone gets dropped onto.

But he had taken the keypad off. Not shrunk it or hidden it: removed it, entirely. There were no buttons on the front of the object at all. Which meant the glass wasn't a window onto the product. The glass was the product — the only part of it a person would ever actually touch, lit from behind ten thousand times a year so that every flaw in it would glow. A scratch on a keypad phone is wear on a window. A scratch on this one was a flaw in the thing itself.

He had stood on a stage in San Francisco on the ninth of January and told the world it would go on sale in June. The date wasn't his any more.

So he wanted glass. And he didn't want it from a supplier — he wanted it from the best glass company that had ever existed, which he could name without having to look it up, because he'd read everything about Edison as a young man and he knew perfectly well who had blown the envelopes for Edison's lamps.

V — The Man on the Other End

Wendell Weeks had joined Corning in 1983, at twenty-four, in the finance department. He had been chief executive for about eighteen months. And the thing worth knowing about him is that he had already watched the company nearly die, from close enough to have been holding part of it at the time.

In September of 2000 Corning traded at a hundred and thirteen dollars a share. The world was going to be wired end to end in optical fibre; Corning made the best fibre on earth; and so Corning did what a confident company does, which is build. New plants, new capacity, thousands of people hired into a future that every serious person in the industry agreed was already on its way.

By the autumn of 2002 the stock was a dollar and change.

Weeks had been running the fibre business. Not watching it from somewhere safe — it was his. He went out to the plants and stood in rooms full of people who had moved their families for jobs he had helped promise them, and told them the future they'd been hired for was cancelled, and then drove home. Nobody who has done that ever entirely stops doing it. A company that had been melting silica since before the light bulb came within a couple of bad quarters of not existing, and it hadn't happened because the fibre was bad. The fibre was magnificent. It happened because they had built a road to a city that never got built.

He came out of those rooms with a rule, which was that he would never again bet this company on a customer who wasn't standing in front of him.

The other thing he did, once he had the job, was take the ceiling out. He liked to say that the separation between himself and any bench scientist at the company was nonexistent, and he seems to have meant it in a practical way rather than a warm one — he'd made it possible for a researcher to start work on something without first sitting through a meeting about whether they were allowed to. He asked his people for what he cheerfully called a degree of insubordination. It sounded like the sort of thing chief executives say. It was about to be the only reason any of this worked.

In February of 2007 his telephone rang.

It went badly at first. The voice from California started, within about a minute, explaining to the chief executive of Corning how glass is made, and got a fair way into it before Weeks interrupted him.

"Can you shut up," he said, "and let me teach you some science?"

There was a pause on the line. Then: go ahead.

So he did. He explained ion exchange — the sodium, the potassium, the surface that ends up crushing itself shut. And then he mentioned, because it was relevant, that Corning had built this material already, in the sixties, and had never in nine years of trying found a single customer who wanted it.

But Jobs wanted it. And he wanted it thinner — one point three millimetres — in quantity, shipping in June.

Nothing like that had ever been manufactured at that thickness, in that volume, anywhere. There was no line running the material and hadn't been for decades. To do it, Weeks would have to take a plant that was currently running, currently profitable, currently making glass that customers were currently paying for, tear the process out of it, and re-point it at a product that had failed commercially before most of the people on that floor were born.

He said no.

Then the voice told him he was afraid, which was true, and he said so — anybody who actually understood the question would be.

And then he thought about the rule.

The fibre had nearly finished them because they'd built for a customer who existed only in a forecast. This one was on the telephone. Today. For five months. And then, in all likelihood, never again.

He said yes.

VI — Sullivan Park

What came out of the file wasn't a formula. It was the formula for a different object — a four-millimetre sheet of automotive glazing, made by processes Corning no longer ran, designed in a decade when nobody had heard of a touchscreen.

Two compositional scientists, Adam Ellison and Matt Dejneka, were handed it at the research campus on the hill above town and asked to turn it into something a third as thick, clear enough to look at all day, and — this was the constraint that nearly ended the whole thing — capable of being made on machinery that already existed.

Inventing a new way to form glass takes years. They had until spring. So it had to run on the fusion draw.

Picture a long, narrow trough filled a little past the brim with molten glass. It spills over both long edges at once and runs down the outside walls in two thin sheets. The bottom of the trough comes to a point, and there the two sheets meet each other and fuse back into one, and that single ribbon is drawn steadily downward and away. Pull faster and it comes out thinner.

The reason to go to all that trouble is what doesn't happen. The two outer faces of the finished ribbon are the faces that ran down the outside of the trough, and neither of them has touched anything but air — no roller has pressed them, no belt has carried them, nothing has polished them. That's how Corning could make glass that thin and that flat, and it was the one part of the whole operation that wasn't up for negotiation.

The fusion draw is also fussy about what you feed it. It wants a glass that goes, in Ellison's phrase, extra stretchy — like chewing gum — at a fairly low temperature, so the ribbon holds itself together on the way down.

0317 wouldn't do that, and the reason it wouldn't is the sort of problem that makes people quiet in meetings. The things that let a glass swap its ions deeply and quickly, which is exactly what a phone needs, are the same things that make it stiff and hard to melt, which is exactly what the fusion line can't have. Improve the one and you spoil the other. There's no version that's simply better; there are only trades, and somebody has to choose them.

So Ellison's team went into the composition and moved seven things at once — adjusting the oxide levels, and adding a single ingredient Corning has never named. Every candidate meant a melt, and a melt takes time nobody had. Dejneka spent that winter making samples and then destroying them: dragging grit across them, dropping them onto surfaces, bending sheets in a frame until they let go with a noise like a rifle shot.

Nobody stopped to ask permission for any of it, which was the insubordination Weeks had been talking about, and which turned out to be the only thing that made the calendar survivable. Corning's ordinary path from research to product runs about two years. The heartbeat of a hundred-and-fifty-year-old company that fully intends to see another hundred and fifty is slow on purpose, and there is usually a good argument for that.

By the end of March they had it. A glass that took a deeper compression than the original, exchanged its ions faster, and would go over the trough like chewing gum.

VII — Harrodsburg

The plant sits in horse country an hour south of Lexington, among bluegrass and white fences, which is nobody's first guess for where the future of the telephone gets made.

It opened in 1952, making optical glass — binocular lenses, periscope lenses, glass for aerial photography. When that work dried up in the eighties the plant wasn't closed; it was turned over to liquid-crystal display glass, and the engineers on that floor improved the fusion draw enough that Corning still calls the place its centre of excellence for melting and fusion. It is, in other words, a plant that had already reinvented itself once and survived the experience.

In early 2007 Harrodsburg was running seven tanks, fifteen feet apiece, producing more than a thousand pounds an hour of display glass for televisions. A real business, with customers and orders and delivery dates.

They took one of the seven.

You can't ease a glass tank from one product to another. It runs at temperatures that take days to reach and weeks to come back from, and everything about it — the melt chemistry, the flow, the draw rate, the people who can hear when something has started to go wrong — has been tuned over years to make one thing extremely well. What that tank was being asked to do was keep the fire and give up everything else.

Most of April went into it. The old melt had to be run out and the new batch charged in, and then the line had to learn a glass it had never handled. The first ribbons came down wrong — a composition that behaves beautifully on a laboratory melt behaves like a stranger at a thousand pounds an hour — and every correction took hours to work its way through the tank before anyone could see whether it had helped. There was no second tank to practise on, and no time to build one.

It began producing to specification in May.

What came down off the draw was a ribbon a millimetre and a third thick that had never been touched by anything. It was cut into sheets, and the sheets went into potassium salt held at four hundred degrees and lay there for hours while the small atoms climbed out and the large ones climbed in. What was lifted from the bath and cooled was a piece of glass in a permanent argument with itself: the surface crushing inward, the core pulling outward, and the whole thing holding.

By the last week of June they had made enough of it to cover seven football fields.

Somewhere in there Weeks made a telephone call west. There's no record of what was said on it, only that the answer was yes — the tank is running, the glass is good, it will be there in time. Two companies that had each spent the spring betting everything they had on the other one's competence, finding out they'd both been right.

It shipped on the twenty-ninth of June, into the hands of people who'd queued overnight and who had no idea that the surface under their thumbs had been designed for a windshield in 1962, turned down by Ford, filed away in 1971, and pulled back out of the dark by a phone call in February.

Corning made twenty million dollars from the material that year. Four years later it was making seven hundred million.

Some time after the launch a note reached Weeks in New York, from California. It was one sentence long.

We couldn't have done it without you.