success of Sarah’s extravaganza. It was now January 30, thirty-six days after the Event. Herb suggested that the date be observed in perpetuity as Parade Day. His motion, seconded by Roxy, passed without opposition.
“Quite a parliamentary coup,” Tom said drily. “Don’t get me wrong, I think it’s a terrific idea. I just wonder what the greater community will think of it.”
As the night sky darkened, the group lit one of their precious candles and toasted the muses, drinking the sorghum beer that a Zulu dancer had given to Roxy, his fellow artist, as a gesture of friendship. The six were in high spirits, although well aware that this party atmosphere could not last.
“It’s back to the grindstone tomorrow,” Wil said. “For me it’s back to the good old Joint Planning Subcommittee.”
“What’s on the agenda?” Sarah asked.
“Ichiro Nagasaka will hold forth on the topic of iron and steel. This is the moment he’s been waiting for. Frankly, it’s a moment I’ve been waiting for, too. It’s exciting to be in the center of such a momentous enterprise. Rebuilding an industrial society from scratch.”
“Progress,” Roxy said. “Soon there will be factories, probably standing right about here, spoiling our view of the water. I can’t wait!”
“Soot-filled skies and black-lunged workers,” Herb put in.
“But you have to admit that it’s exciting,” Wil said. “Making our way out of the Stone Age into the Iron Age.”
“Iron schmiron,” Roxy said with a shrug. “Everyone carries on about the Iron Age, the iron horse, and all that stuff. I say it’s just bad poetry for a heartless world. Really, what’s the big deal about something that’s just a metal?”
“It is a big deal, Roxy,” Tom replied. “A very big deal. Instead of complaining, you people should be singing hymns of praise. The universe has given us ninety-two elements with which to work, and out of those ninety-two, iron has a special place, a very special place. Without this unique element—and without the people who were able to discover its secrets—human civilization as we know it would never have evolved.”
“Ninety-two elements,” Herb said. “Isn’t that a peculiar number?”
“It’s a fabulous number,” Tom said excitedly. “As you learned in your high school chemistry class.”
“You’re assuming a lot for this crowd,” Sarah put in.
“Anyway,” Tom went on, controlling his exasperation, “the elements are the basic building blocks of the material world. We list them according to the number of electrons they have spinning around in orbit, which is the same as the number of protons they have in their nucleus. You’ve seen those pictures of electrons in orbit around the atomic nucleus. Well, a drawing can’t really show what an atom is, but speaking as an engineer—not a nuclear physicist, mind you—I would say that the image serves us pretty well.”
Warming to his topic, Tom continued: “Uranium, which has ninety-two electrons, is the largest atom we find in nature. Any atom with more than ninety-two electrons is too large to hang together. The nucleus is unstable and the outer electrons tend to go flying off into space. Physicists, by using fancy, high-powered equipment—cyclotrons and linear accelerators—have managed to paste together another twenty-two or so elements; but such artificially made atoms break apart very quickly. So, to repeat, there are ninety-two elements which the universe gives us to use.”
“Or to leave as we find them,” Roxy muttered.
“Yes, of course,” Tom said. “But since we humans seem to be curious, comfort-seeking, and innately creative, the universe couldn’t have expected us to keep our hands to ourselves. Just think of it. All the world is made of this wonderfully organized stuff! For us engineers, it’s the most fabulous erector set one could wish for. Maybe erector set is the wrong image, since the same atoms we incorporate into manufactured objects are the basic material of burning stars and living beings. Also, they’re not material or substantial in any familiar sense. They are will-o’-the-wisp electrical ‘wavicles’—sort of waves, sort of particles—if I understand the physicists correctly. But for engineers, their orderly behavior is what counts.
“And, you know—this is what’s so incredible as we sit here on a beach with the world in ruins—it really doesn’t matter how many comets collide or how many planets are destroyed. The elements remain, and with them the capacity to reconstitute anything that has ever been, and wonders still undreamed of. Add to this the knowledge we have of what the elements are, and how they behave, and we haven’t been defeated at all. We have the makings—physical and intellectual—of a new world.”
“I thought we were talking about iron,” Herb said, with only the slightest hint of sarcasm.
“Yes, we were,” Tom said. “And we are. Among the ninety-two elements, iron with its twenty-six electrons is very, very special. When you get a reasonably pure collection of iron atoms, they arrange themselves into a nice crystalline pattern—ideal for strength—with just the right amount of internal slip—perfect for flexibility. Then, if you take iron and combine it chemically with a little bit of carbon—that is, let a few carbon atoms arrange themselves in the interstitial spaces between the iron atoms—you get the material we call steel. It’s the most useful material a tool-using, machine-making, invention-loving species could possibly want. Which means that we engineers, in discovering the secrets of iron and steel, are the makers of marvels.”
Tom Swift—calm, stoical Tom—was suddenly more animated than his friends had ever seen him. “If we’re concerned about rebuilding the world,” he said, “we should be thinking long and hard about iron. I mean, really long and really hard. What do you think that civilization is? Poems and paintings? Pretty flags and patriotic songs? No, my friends, at the heart of civilization you will find iron and steel.”
“There are other metals,” Herb said. “Why is iron so special?”
“All metals share some characteristics,” Tom responded, “but each one is unique. Believe me when I tell you that for tools, structures, and machines, iron has proved to be uniquely serviceable. Particularly when it’s mixed with a bit of carbon to make steel. And wonder of wonders, iron is plentiful. In fact, it constitutes four percent of the material in the earth’s crust. Considering its attributes and its availability—well, the whole thing is nothing short of magical.”
“Not magical,” said Mary, who had been quiet up to this point. “It’s a miracle. God’s miracle.”
“You’ve got a pretty materialistic idea about what a miracle is,” Roxy said. Her tone was critical but not unfriendly.
“That’s what happens when you mix an engineer with a believer,” Sarah said.
“Okay,” Herb pressed, allowing his curiosity to show through in spite of himself, “but how and why is this stuff so amazing?”
“First of all,” Tom said, “steel is a very hard material, by which I mean it resists penetration, it resists deformation, it resists abra sion and wear. Steel is also tough, which is different from hard: a material that is tough can absorb energy during deformation, resisting the extension of cracks. For example, in a collision, it will dent instead of shattering. In addition to being hard and tough, steel is strong, which means it can sustain heavy loads, in tension and shear, as well as in compression.
“When stressed, it will deform only slightly, elastically, returning to its original shape after the stress is removed. Yet if we stress it heavily enough—and we can calculate the forces with precision—it will deform plastically, maintaining its new shape. We can cast it, mold it, stamp it, cut it, extrude it, machine it—in so many ways fashion it to serve our needs. Hard, tough, strong, ductile; we’re talking about a uniquely utilitarian substance. And all because of the ways in which iron atoms arrange themselves when they’re together in a group.”
Flushed with excitement, raising his voice, Tom continued: “I tell you, the stuff is precious. At the same time, there’s plenty of iron in many parts of the world and limitless amounts of carbon, which means that steel is comparatively inexpensive. Which makes it all the more precious, if you get my meaning. This wonderful material is responsive to our every whim. Add more carbon and the steel becomes harder. A little less, and the steel will bend more readily while retaining its toughness. If we want a tool that is very hard on the outside, to resist abrasion, yet tough on the inside—to be able to absorb shock, for example—we simply add carbon to the outer surfaces; we call it case hardening. For other special features, we can add different materials, such as chromium to make it stainless, that is, resistant to corrosion. By using changes of temperature, we can work more miracles. Heat steel and cool it slowly—the process of annealing—the material becomes softer and more malleable, just right for molding into car body panels or cooking pots. Cool it suddenly, by quenching in liquid, and it becomes harder. And if this sudden cooling creates unwanted internal stresses, they can be relieved by reheating—that’s called tempering.”
Wil Hardy could not resist putting on his graduate student’s hat. “Of course,” he ventured, “none of the chemical reasons for this behavior were known until late in human history.”
