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发信人: emanuel (小飞象), 信区: SFworld
标 题: Fountains of Paradise - 19,20
发信站: 哈工大紫丁香 (Thu Jul 13 12:57:43 2000), 转信
发信人: Sandoval (Companion Protector), 信区: SciFiction
标 题: Fountains of Paradise - 19,20
发信站: The unknown SPACE (Tue May 30 00:44:41 2000) WWW-POST
19. By the Shores of Lake Saladin
Almost all the Alternative History computer simulations
suggest that the Battle of Tours (AD 732) was one of the
crucial disasters of mankind. Had Charles Martel been
defeated, Islam might have resolved the internal differences
that were tearing it apart and gone on to conquer Europe.
Thus centuries of Chistian barbarism would have been
avoided, the Industrial Revolution would have started almost
a thousand years earlier, and by now we would have reached
the nearer stars instead of merely the further planets...
But fate ruled otherwise, and the armies of the Prophet
turned back into Africa. Islam lingered on, a fascinating
fossil, until the end of the twentieth century. Then,
abruptly, it was dissolved in oil...
(Chairman's Address: Toynbee Bi-centennial Symposium,
London, 2089.)
"Did yo know," said Sheik Farouk Abdullah, "that I have
now appointed myself Grand Admiral of the Sahara Fleet?"
"It wouldn't surprise me, Mr. President," Morgan
answered, as he gazed out across the sparkling blue expanse
of Lake Saladin. "If it's not a naval secret, how many ships
do you have?"
"Ten at the moment. The largest is a thirty-metre
hydroskimmer run by the Red Crescent; it spends every
weekend rescuing incompetent sailors. My people still aren't
much good on the water - look at that idiot tring to tack!
After all, two hundred years really isn't long enough to
switch from camels to boats."
"You had Cadillacs and Rolls-Royces in between. Surely
that should have eased the transition."
"And we still have them; my
great-great-great-grandfather's Silver Ghost is just as good
as new. But I must be fair - it's the visitors who get into
trouble, trying to cope with our local winds. We stick to
power-boats. And next year I'm getting a submarine
guaranteed to reach the lake's maximum depth of 8 metres."
"Whatever for?"
"For they tell us that the Erg was full of
archaeological treasures. Of course, no-one bothered about
them before it was flooded."
It was no use trying to hurry the President of ANAR -
the Autonomous North African Republic - and Morgan knew
better than to attempt it. Whatever the Constitution might
say, Sheik Abdullah controlled more power and wealth than
almost any single individual on earth. Even more to the
point, he understood the uses of both.
He came frm a family that was not afraid to take risks,
and very seldom had cause to regret them. Its first and most
famous gamble - which had incurred the hatred of the whole
Arab world for almost half a century - was the investment of
its abundant petro-dollars in the science and technology of
Israel. That farsighted act had led directly to the mining
of the Red Sea, the defeat of the deserts, and, very much
later, to the Gibraltar Bridge.
"I don't have to tell you, Van," said the Sheik at last,
"how much your new project fascinates me. And after all that
we went through together while the Bridge was being built, I
know that you could do it - given the resources."
"Thank you."
"But I have a few questions. I'm still not clear why
there's Midway Station - and why it's at a height of
twenty-five thousand kilometres."
"Several reasons. We needed a major power plant at about
that level, which would involve fairly massive construction
there in any case. Then it occurred to us that seven hours
was too long to stay cooped up in a rather cramped cabin,
and splitting the journey gave a number of advantages. We
shouldn't have to feed the passengersin transit-they could
eat and stretch their legs at the Station. We could also
optimise the vehicle design; only the capsules on the lower
section would have to be streamlined. Those on the upper run
could be much simpler and lighter. The Midway Station would
not only serve as a transfer point, but as an operations and
control center and ultimately, we believe, as a major
tourist attraction and resort in its own right."
"But it's not midway! It's almost - ah - two-thirds of
the distance up to stationay orbit."
"True; the mid-point would be at eighteen thousand, not
twenty-five. But there's another factor - safety. If the
section above is severed, the Midway Station won't crash
back to Earth."
"Why not?"
"It will have enough momentum to maintain a stable
orbit. Of course, it will fall earthward, but it will always
remain clear of the atmosphere. So it will be perfectly safe
- it will simply become a space station, moving in a
ten-hour, elliptical orbit. Twice a day it will be right
back where it started from, and eventually it could be
reconnected. In theory, at least..."
"And in practice?"
"Oh, I'm sure it could be done. Certainly the people and
equipment on the station could be saved. But we wouldn't
have even that option if we established it at a lower
altitude. Anything falling from below the twenty-five
thousand kilometre limit hits the atmosphere and burns up in
five hours, or less."
"Would you propose advertising this fact to passengers
on the Earth-Midway run?"
"We hope they would be too busy admiring the view to
worry about it."
"You make it sound like a scenic elevator."
"Why not? Except that the tallest scenic ride on earth
only goes up a mere three kilometres! We're talking about
something ten thousand times higher."
There was a considerable pause while Sheik Abdullah
thought this over.
"We missed an opportunity," he said at last. "We could
have had five-kilometre scenic rides up the piers of the
Bridge."
"They were in the original design, but we dropped them
for the usual reason - economy."
"Perhaps we made a mistake; they culd have paid for
themselves. And I've just realised something else. If this -
hyperfilament - had been available at the time I suppose the
Bridge could have been built for half the cost."
"I wouldn't lie to you, Mr. President. Less than a
fifth. But construction would have been delayed more than
twenty years, so you haven't lost by it."
"I must talk that over with my accountants. Some of them
still aren't convinced it was a good idea, even though the
traffic growth rate is ahead of projection. Bt I keep
telling them that money isn't everything - the Republic
needed the Bridge psychologically and culturally, as well as
economically. Did you know that 18 percent of the people who
drive across it do so just because it's there, not for any
other reason? And then they go straight back again, despite
having to pay the toll both ways."
"I seem to recall," said Morgan dryly, "giving you
similar arguments, a long time ago. You weren't easy to
convince."
"True. I remember that the Sydney Opera Hose was your
favourite example. You liked to point out how many times
that had paid for itself - even in hard cash, let alone
prestige."
"And don't forget the Pyramids."
The Sheik laughed. "What did you call them? The best
investment in the history of mankind?"
"Precisely. Still paying tourist dividends after four
thousand years."
"Hardly a fair comparison, though. Their running costs
don't compare with those of the Bridge much less your
proposed Tower's."
"The Tower may last longerthan the Pyramids. It's in a
far more benign environment."
"That's a very impressive thought. You really believe
that it will operate for several thousand years?"
"Not in its original form, of course. But in principle,
yes. Whatever technical developments the future brings, I
don't believe there will ever be a more efficient, more
economical way of reaching Space. Think of it as another
bridge. But this time a bridge to the stars or at least to
the planets."
"And once again you'd like us to elp finance it. We'll
still be paying for the last bridge for another twenty
years. It's not as if your space elevator was on our
territory, or was of direct importance to us."
"But I believe it is, Mr. President. Your republic is a
part of the terran economy, and the cost of space
transportation is now one of the factors limiting its
growth. If you've looked at those estimates for the 50's and
60's..."
"I have - I have. Very interesting. But though we're not
exactly poor, we couldn't raise a fration of the funds
needed. Why, it would absorb the entire Gross World Product
for a couple of years!"
"And pay it back every fifteen, for ever afterwards."
"If your projections are correct."
"They were, for the Bridge. But you're right, of course,
and I don't expect ANAR to do more than start the ball
rolling. Once you've shown your interest, it will be that
much easier to get other support."
"Such as?"
"The World Bank. The Planetary banks. The Federal
government."
"And your own employers, the Terran Construction
Corporation? What are you really up to, Van?"
Here it comes, thought Morgan, almost with a sigh of
relief. Now at last he could talk frankly with someone he
could trust, someone who was too big to be involved in petty
bureaucratic intrigues - but who could thoroughly appreciate
their finer points.
"I've been doing most of this work in my own time I'm on
vacation right now. And incidentally, that's just how the
Bridge started! I don't know if I ever told you that I was
once officially ordered to forget it... I've lerned a few
lessons in the past fifteen years."
"This report must have taken a good deal of computer
time. Who paid for that?"
"Oh, I have considerable discretionary funds. And my
staff is always doing studies that nobody else can
understand. To tell the truth, I've had quite a little team
playing with the idea for several months. They're so
enthusiastic that they spend most of their free time on it
as well. But now we have to commit ourselves or abandon the
project."
"Does your esteemed Chairman know about this?"
Morgan smiled, without much humour. "Of course not, and
I don't want to tell him until I've worked out all the
details."
"I can appreciate some of the complications," said the
President shrewdly. "One of them, I imagine, is ensuring
that Senator Collins doesn't invent it first."
"He can't do that - the idea is two hundred years old.
But he, and a lot of other people, could slow it down. I
want to see it happen in my lifetime."
"And, of cours, you intend to be in charge... Well,
what exactly would you like us to do?"
"This is merely one suggestion, Mr. President - you may
have a better idea. Form a consortium - perhaps including
the Gibraltar Bridge Authority, the Suez and Panama
Corporations, the English Channel Company, the Bering Dam
Corporation. Then, when it's all wrapped up, approach TCC
with a request to do a feasibility study. At this stage, the
investment will be negligible."
"Meaning?"
"Less than a million. Especially as I've already done 80
ercent of the work."
"And then?"
"Thereafter, with your backing, Mr. President, I can
play it by ear. I might stay with TCC. Or I might resign and
join the consortium - call it Astroengineering. It would all
depend on circumstances. I would do whatever seemed best for
the project."
"That seems a reasonable approach. I think we can work
something out."
"Thank you, Mr. President," Morgan answered with
heartfelt sincerity. "But there's one annoying roadblock we
have to tackle at once - perhaps even before we set p the
consortium. We have to go to the World Court, and establish
jurisdiction over the most valuable piece of real estate on
Earth."
20. The Bridge that Danced
Even in this age of instantaneous communications and
swift global transport, it was convenient to have a place
that one could call one's office. Not everything could be
stored in patterns of electronic charges; there were still
such items as good old-fashioned books, professional
certificates, awards and honours, engineering models,
samples of material, artists' rendering of projects (not as
accurate as a computer's, but very ornamental), and of
course the wall-to-wall carpet which every senior bureucrat
needed to soften the impact of external reality.
Morgan's office, which he saw on the average ten days
per month, was on the sixth or LAND floor of the sprawling
Terran Construction Corporation Headquarters in Nairobi. The
floor below was SEA, that above it ADMINISRATI0N-meaning
Chairman Collins and his empire. The architect, in a fit of
na飗e symbolism, had devoted the top floor to SPACE. There
was even a small observatory on the roof, with a
thirty-centimetre telescope that was always out of order,
because it was onl used during office parties, and
frequently for most non-astronomical purposes. The upper
rooms of the Triplanetary Hotel, only a kilometre away, were
a favourite target, as they often held some very strange
forms of life - or at any rate of behaviour.
As Morgan was in continuous touch with his two
secretaries one human, the other electronic - he expected no
surprises when he walked into the office after the brief
flight from ANAR. By the standards of an earlier age, his
was an extraordinarily small organisation. He had lessthan
three hundred men and women under his direct control; but
the computing and information-processing power at their
command could not be matched by the merely human population
of the entire planet.
"Well, how did you get on with the Sheik?" asked Warren
Kingsley, his deputy and long time friend, as soon as they
were alone together.
"Very well; I think we have a deal. But I still can't
believe that we're held up by such a stupid problem. What
does the legal department say?"
"We'll definitely have to get a World Curt ruling. If
the Court agrees that it's a matter of overwhelming public
interest, our reverend friends will have to move... though
if they decide to be stubborn, there would be a nasty
situation. Perhaps you should send a small earthquake to
help them make up their minds."
The fact that Morgan was on the board of General
Tectonics was an old joke between him and Kingsley; but GT -
perhaps fortunately - had never found a way of controlling
and directing earthquakes, nor did it ever expect to do so.
The best that it could hoe for was to predict them, and to
bleed off their energies harmlessly before they could do
major damage. Even here, its record of success was not much
better than 75 percent.
"A nice idea," said Morgan, "I'll think it over. Now,
what about our other problem?"
"All set to go - do you want it now?"
"O.K. - let's see the worst."
The office windows darkened, and a grid of glowing lines
appeared in the centre of the room.
"Watch this, Van," said Kingsley. "Here's the regime
that gives trouble."
Rows of leters and numbers materialised in the empty
air - velocities, payloads, accelerations, transit times -
Morgan absorbed them at a glance. The globe of the earth,
with its circles of longitude and latitude, hovered just
above the carpet; and rising from it, to little more than
the height of a man, was the luminous thread that marked the
position of the orbital tower.
"Five hundred times normal speed; lateral scale
exaggeration fifty. Here we go."
Some invisible force had started to pluck at the line of
light, drawing it awy from the vertical. The disturbance
was moving upwards as it mimicked, via the computer's
millions of calculations a second, the ascent of a payload
through the earth's gravitational field.
"What's the displacement?" asked Morgan, as his eyes
strained to follow the details of the simulation.
"Now about two hundred metres. It gets to three before
-"
The thread snapped. In the leisurely slow-motion that
represented real speeds of thousands of kilometres an hour,
the two segments of the severed tower began to curl awy
from each other - one bending back to earth, the other
whipping upwards to space...
But Morgan was no longer fully conscious of this
imaginary disaster, existing only in the mind of the
computer; superimposed upon it now was the reality that had
haunted him for years.
He had seen that two-century-old film at least fifty
times, and there were sections that he had examined frame by
frame, until he knew every detail by heart. It was, after
all, the most expensive movie footage ever shot, at least in
peacetime. It had cos the State of Washington several
million dollars a minute.
There stood the slim (too slim!) and graceful bridge,
spanning the canyon. It bore no traffic, but a single car
had been abandoned midway by its driver. And no wonder, for
the bridge was behaving as none before in the whole history
of engineering.
It seemed impossible that thousands of tons of metal
could perform such an aerial ballet; one could more easily
believe that the bridge was made of rubber than of steel.
Vast, slow undulations, metres in amplitude, wer sweeping
along the entire width of the span, so that the roadway
suspended between the piers twisted back and forth like an
angry snake. The wind blowing down the canyon was sounding a
note far too low for any human ears to detect, as it hit the
natural frequency of the beautiful, doomed structure. For
hours, the torsional vibrations had been building up, but
no-one knew when the end would come. Already, the protracted
death-throes were a testimonial that the unlucky designers
could well have foregone.
Suddenly, the supportng cables snapped, flailing
upwards like murderous steel whips. Twisting and turning,
the roadway pitched into the river, fragments of the
structure flying in all directions. Even when projected at
normal speed, the final cataclysm looked as if shot in slow
motion; the scale of the disaster was so large that the
human mind had no basis of comparison. In reality, it lasted
perhaps five seconds; at the end of that time, the Tacoma
Narrows Bridge had earned an inexpungable place in the
history of engineering. Two hundred years laterthere was a
photograph of its last moments on the wall of Morgan's
office, bearing the caption "One of our less successful
products".
To Morgan that was no joke, but a permanent reminder
that the unexpected could always strike from ambush. When
the Gibraltar Bridge was being designed, he had gone
carefully through von K醨m醤's classic analysis of the
Tacoma Narrows disaster, learning all he could from one of
the most expensive mistakes of the past. There had been no
serious vibrational problems even in the worst gales that
hd come roaring in from the Atlantic, though the roadway
had moved a hundred metres from the centre line precisely as
calculated.
But the space elevator was such a leap forward into the
unknown that some unpleasant surprises were a virtual
certainty. Wind forces on the atmospheric section were easy
to estimate, but it was also necessary to take into account
the vibrations induced by the stopping and starting of the
payloads - and even, on so enormous a structure, by the
tidal effects of the sun and moon. And not only
individully, but acting all together; with, perhaps, an
occasional earthquake to complicate the picture, in the
so-called "worst case" analysis.
"All the simulations, in this tons-of-payload-per-hour
regime, give the same result. The vibrations build up until
there's a fracture at around five hundred kilometres. We'll
have to increase the damping - drastically."
"I was afraid of that. How much do we need?"
"Another ten megatons."
Morgan could take some gloomy satisfaction from the
figure. That was very close to the guss he had made, using
his engineer's intuition and the mysterious resources of his
subconscious. Now the computer had confirmed it; they would
have to increase the "anchor" mass in orbit by ten million
tons.
Even by terrestrial earth-moving standards, such a mass
was hardly trivial; it was equivalent to a sphere of rock
about two hundred metres across. Morgan had a sudden image
of Yakkagala, as he had last seen it, looming against the
Taprobanean sky. Imagine lifting that forty thousand
kilometres into space! Fortunately, itmight not be
necessary; there were at least two alternatives.
Morgan always let his subordinates do their thinking for
themselves; it was the only way to establish responsibility,
it took much of the load off him - and, on many occasions,
his staff had arrived at solutions he might have overlooked.
"What do you suggest, Warren?" he asked quietly.
"We could use one of the lunar freight launchers, and
shoot up ten megatons of moon-rock. It would be a long and
expensive job, and we'd still need a large space-based
opeation to catch the material and steer it into final
orbit. There would also be a psychological problem -"
"Yes, I can appreciate that; we don't want another San
Luiz Domingo -"
San Luiz had been the - fortunately small - South
American village that had received a stray cargo of
processed lunar metal intended for a low-orbit space
station. The terminal guidance had failed, resulting in the
first man-made meteor crater - and two hundred and fifty
deaths. Ever since that, the population of planet Earth had
been very sensitve on the subject of celestial target
practice.
"A much better answer is to catch an asteroid; we're
running a search for those with suitable orbits, and have
found three promising candidates. What we really want is a
carbonaceous one - then we can use it for raw material when
we set up the processing plant. Killing two birds with one
stone."
"A rather large stone, but that's probably the best
idea. Forget the lunar launcher - a million 10-ton shots
would tie it up for years, and some of them would be bound
to go astray If you can't find a large enough asteroid, we
can still send the extra mass up by the elevator itself -
though I hate wasting all that energy if it can be avoided."
"It may be the cheapest way. With the efficiency of the
latest fusion plants, it will take only twenty dollars'
worth of electricity to lift a ton up to orbit."
"Are you sure of that figure?"
"It's a firm quotation from Central Power."
Morgan was silent for a few minutes. Then he said: "The
aerospace engineers really are going to hate me." Almost s
much, he added to himself, as the Venerable Parakarma.
No - that was not fair. Hate was an emotion no longer
possible to a true follower of the Doctrine. What he had
seen in the eyes of ex-Doctor Choam Goldberg was merely
implacable opposition; but that could be equally dangerous.
--
... In 2345, on the 10th anniversary of the Shivan attack
on Ross 128, the Vasudan emperor Khonsu II addressed the
newly formed GTVA General Assembly. The emperor inaugurated
an ambiguous and unprecedented joint endeavor: the GTVA
Colossus...
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