The Collected Stories of Arthur C. Clarke (49 page)

At this point I had better explain who ‘we’ are. That is not as easy as I thought it was going to be when I started, for a complete catalogue of the ‘White Hart’s’ clients would probably be impossible and would certainly be excruciatingly tedious. So all I’ll say at this point is that ‘we’ fall into three main classes. First there are the journalists, writers and editors. The journalists, of course, gravitated here from Fleet Street. Those who couldn’t make the grade fled elsewhere; the tougher ones remained. As for the writers, most of them heard about us from other writers, came here for copy, and got trapped.

Where there are writers, of course, there are sooner or later editors. If Drew, our landlord, got a percentage on the literary business done in his bar, he’d be a rich man. (We suspect he is a rich man, anyway.) One of our wits once remarked that it was a common sight to see half a dozen indignant authors arguing with a hard-faced editor in one corner of the ‘White Hart’, while in another, half a dozen indignant editors argued with a hard-faced author.

So much for the literary side: you will have, I’d better warn you, ample opportunities for close-ups later. Now let us glance briefly at the scientists. How did
they
get in here?

Well, Birkbeck College is only across the road, and King’s is just a few hundred yards along the Strand. That’s doubtless part of the explanation, and again personal recommendation had a lot to do with it. Also, many of our scientists are writers, and not a few of our writers are scientists. Confusing, but we like it that way.

The third portion of our little microcosm consists of what may be loosely termed ‘interested laymen’. They were attracted to the ‘White Hart’, by the general brouhaha, and enjoyed the conversation and company so much that they now come along regularly every Wednesday—which is the day when we all get together. Sometimes they can’t stand the pace and fall by the wayside, but there’s always a fresh supply.

With such potent ingredients, it is hardly surprising that Wednesday at the ‘White Hart’ is seldom dull. Not only have some remarkable stories been told there, but remarkable things have
happened
there. For example, there was the time when Professor —, passing through on his way to Harwell left behind a briefcase containing—well, we’d better not go into that, even though we did so at the time. And most interesting it was, too…. Any Russian agents will find me in the corner under the dartboard. I come high, but easy terms can be arranged.

Now that I’ve finally thought of the idea, it seems astonishing to me that none of my colleagues has ever got round to writing up these stories. Is it a question of being so close to the wood that they can’t see the trees? Or is it lack of incentive? No, the last explanation can hardly hold: several of them are quite as hard up as I am, and have complained with equal bitterness about Drew’s ‘
NO CREDIT
’ rule. My only fear, as I type these words on my old Remington Noiseless, is that John Christopher or George Whitley or John Beynon are already hard at work using up the best material. Such as, for instance, the story of the Fenton Silencer…

I don’t know when it began: one Wednesday is much like another and it’s hard to tag dates onto them. Besides, people may spend a couple of months lost in the ‘White Hart’ crowd before you first notice their existence. That had probably happened to Harry Purvis, because when I first became aware of him he already knew the names of most of the people in our crowd. Which is more than I do these days, now that I come to think of it.

But though I don’t know
when
, I know exactly
how
it all started. Bert Huggins was the catalyst, or, to be more accurate, his voice was. Bert’s voice would catalyse anything. When he indulges in a confidential whisper, it sounds like a sergeant major drilling an entire regiment. And when he lets himself go, conversation languishes elsewhere while we all wait for those cute little bones in the inner ear to resume their accustomed places.

He had just lost his temper with John Christopher (we all do this at some time or other) and the resulting detonation had disturbed the chess game in progress at the back of the saloon bar. As usual, the two players were surrounded by backseat drivers, and we all looked up with a start as Bert’s blast whammed overhead. When the echoes died away, someone said: ‘I wish there was a way of shutting him up.’

It was then that Harry Purvis replied: ‘There is, you know.’

Not recognising the voice, I looked round. I saw a small, neatly dressed man in the late thirties. He was smoking one of those carved German pipes that always make me think of cuckoo clocks and the Black Forest. That was the only unconventional thing about him: otherwise he might have been a minor Treasury official all dressed up to go to a meeting of the Public Accounts Committee.

‘I beg your pardon?’ I said.

He took no notice, but made some delicate adjustments to his pipe. It was then that I noticed that it wasn’t, as I’d thought at first glance, an elaborate piece of wood carving. It was something much more sophisticated—a contraption of metal and plastic like a small chemical engineering plant. There were even a couple of minute valves. My God, it
was
a chemical engineering plant….

I don’t goggle any more easily than the next man, but I made no attempt to hide my curiosity. He gave me a superior smile.

‘All for the cause of science. It’s an idea of the Biophysics Lab. They want to find out exactly what there is in tobacco smoke—hence these filters. You know the old argument—
does
smoking cause cancer of the tongue, and if so, how? The trouble is that it takes an awful lot of—er—distillate to identify some of the obscurer byproducts. So we have to do a lot of smoking.’

‘Doesn’t it spoil the pleasure to have all this plumbing in the way?’

‘I don’t know. You see, I’m just a volunteer. I don’t smoke.’

‘Oh,’ I said. For the moment, that seemed the only reply. Then remembered how the conversation had started.

‘You were saying,’ I continued with some feeling, for there was still a slight tintinus in my left ear, ‘that there was some way of shutting up Bert. We’d all like to hear it—if that isn’t mixing metaphors somewhat.’

‘I was thinking,’ he replied, after a couple of experimental sucks and blows, ‘of the ill-fated Fenton Silencer. A sad story—yet, I feel, one with an interesting lesson for us all. And one day—who knows?—someone
may
perfect it and earn the blessings of the world.’

Suck, bubble, bubble,
plop
…

‘Well, let’s hear the story. When did it happen?’

He sighed.

‘I’m almost sorry I mentioned it. Still, since you insist—and, of course, on the understanding that it doesn’t go beyond these walls.’

‘Er—of course.’

‘Well, Rupert Fenton was one of our lab assistants. A very bright youngster, with a good mechanical background, but, naturally, not very well up in theory. He was always making gadgets in his spare time. Usually the idea was good, but as he was shaky on fundamentals the things hardly ever worked. That didn’t seem to discourage him: I think he fancied himself as a latter-day Edison, and imagined he could make his fortune from the radio tubes and other oddments lying around the lab. As his tinkering didn’t interfere with his work, no one objected: indeed, the physics demonstrators did their best to encourage him, because, after all, there is something refreshing about any form of enthusiasm. But no one expected he’d ever get very far, because I don’t suppose he could even integrate
e
to the
x
.’

‘Is such ignorance
possible
?’ gasped someone.

‘Maybe I exaggerate. Let’s say
x e
to the
x
. Anyway, all his knowledge was entirely practical—rule of thumb, you know. Give him a wiring diagram, however complicated, and he could make the apparatus for you. But unless it was something
really
simple, like a television set, he wouldn’t understand how it worked. The trouble was, he didn’t realise his limitations. And that, as you’ll see, was most unfortunate.

‘I think he must have got the idea while watching the Honours physics students doing some experiments in acoustics. I take it, of course, that you all understand the phenomenon of interference?’

‘Naturally,’ I replied.

‘Hey!’ said one of the chess-players, who had given up trying to concentrate on the game (probably because he was losing). ‘
I
don’t.’

Purvis looked at him as though seeing something that had no right to be around in a world that had invented penicillin.

‘In that case,’ he said coldly, ‘I suppose I had better do some explaining.’ He waved aside our indignant protests. ‘No, I insist. It’s precisely those who don’t understand these things who need to be told about them. If someone had only explained the theory to poor Fenton while there was still time…’

He looked down at the now thoroughly abashed chess-player.

‘I do not know,’ he began, ‘if you have ever considered the nature of
sound
. Suffice to say that it consists of a series of waves moving through the air. Not, however, waves like those on the surface of the sea—oh dear no!
Those
waves are up and down movements. Sound waves consist of alternate com—

‘Don’t you mean “rarefications”?’

‘Rare-what?’

‘Rarefactions.’ ‘Don’t you mean “rarefications”?’

‘I do not. I doubt if such a word exists, and if it does, it shouldn’t,’ retorted Purvis, with the aplomb of Sir Alan Herbert dropping a particularly revolting neologism into his killing bottle. ‘Where was I? Explaining sound, of course. When we make any sort of noise, from the faintest whisper to that concussion that went past just now, a series of pressure changes moves through the air. Have you ever watched shunting engines at work on a siding? You see a perfect example of the same kind of thing. There’s a long line of goods wagons, all coupled together. One end gets a bang, the first two trucks move together—and then you can see the compression wave moving right along the line. Behind it the reverse thing happens—the rarefaction—I repeat,
rarefaction
—as the trucks separate again.

‘Things are simple enough when there is only one source of sound—only one set of waves. But suppose you have two wave patterns, moving in the same direction? That’s when interference arises, and there are lots of pretty experiments in elementary physics to demonstrate it. All we need worry about here is the fact—which I think you will all agree is perfectly obvious—that if one could get two sets of waves
exactly
out of step, the total result would be precisely zero. The compression pulse of one sound wave would be on top of the rarefaction of another—net result—no change and hence no sound. To go back to my analogy of the line of wagons, it’s as if you gave the last truck a jerk and a push simultaneously. Nothing at all would happen.

‘Doubtless some of you will already see what I am driving at, and will appreciate the basic principle of the Fenton Silencer. Young Fenton, I imagine, argued in this manner. ‘This world of ours,’ he said to himself, ‘is too full of noise. There would be a fortune for anyone who could invent a really perfect silencer. Now, what would that imply…?

‘It didn’t take him long to work out the answer: I told you he was a bright lad. There was really very little in his pilot model. It consisted of a microphone, a special amplifier, and a pair of loud-speakers. Any sound that happened to be about was picked up by the mike, amplified and
inverted
so that it was exactly out of phase with the original noise. Then it was pumped out of the speakers, the original wave and the new one cancelled out, and the net result was silence.

‘Of course, there was rather more to it than that. There had to be an arrangement to make sure that the cancelling wave was just the right intensity—otherwise you might be worse off than when you started. But these are technical details that I won’t bore you with. As many of you will recognise, it’s a simple application of negative feedback.’

‘Just a moment!’ interrupted Eric Maine. Eric, I should mention, is an electronics expert and edits some television paper or other. He’s also written a radio play about space flight, but that’s another story. ‘Just a moment! There’s something wrong here. You
couldn’t
get silence that way. It would be impossible to arrange the phase….’

Purvis jammed the pipe back in his mouth. For a moment there was an ominous bubbling and I thought of the first act of
Macbeth
. Then he fixed Eric with a glare.

‘Are you suggesting,’ he said frigidly, ‘that this story is untrue?’

‘Ah—well, I won’t go as far as that, but…’ Eric’s voice trailed away as if he had been silenced himself. He pulled an old envelope out of his pocket, together with an assortment of resistors and condensers that seemed to have got entangled in his handkerchief, and began to do some figuring. That was the last we heard from him for some time.

‘As I was saying,’ continued Purvis calmly, ‘
that’s
the way Fenton’s. Silencer worked. His first model wasn’t very powerful, and it couldn’t deal with very high or very low notes. The result was rather odd. When it was switched on, and someone tried to talk, you’d hear the two ends of the spectrum—a faint bat’s squeak, and a kind of low rumble. But he soon got over that by using a more linear circuit (dammit, I can’t help using
some
technicalities!) and in the later model he was able to produce complete silence over quite a large area. Not merely an ordinary room, but a full-sized hall. Yes…

‘Now Fenton was not one of these secretive inventors who won’t tell anyone what they are trying to do, in case their ideas are stolen. He was all too willing to talk. He discussed his ideas with the staff and with the students, whenever he could get anyone to listen. It so happened that one of the first people to whom he demonstrated his improved Silencer was a young arts student called—I think—Kendall, who was taking physics as a subsidiary subject. Kendall was much impressed by the Silencer, as well he might be. But he was not thinking, as you may have imagined, about its commercial possibilities, or the boon it would bring to the outraged ears of suffering humanity. Oh dear no—He had quite other ideas.