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 nimble. 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.
"Please permit me a slight digression. At College we have a flourishing Musical Society, which in recent years has grown in numbers to such an extent that it can now tackle the less monumental symphonies. In the year of which I speak, it was embarking on a very ambitious enterprise. It was going to produce a new opera, a work by a talented young composer whose name it would not be fair to mention, since it is now well-known to you all. Let us call him Edward England. I've forgotten the title of the work, but it was one of these stark dramas of tragic love which, for some reason I've never been able to understand, are supposed to be less ridiculous with a musical accompaniment than without. No doubt a good deal depends on the music.
"I can still remember reading the synopsis while waiting for the curtain to go up, and to this day have never been able to decide whether the libretto was meant seriously or not. Let's see—the period was the late Victorian era, and the main characters were Sarah Stampe, the passionate postmistress, Walter Partridge, the saturnine gamekeeper, and the squire's son, whose name I forget. It's the old story of the eternal triangle, complicated by the villager's resentment of change—in this case, the new telegraph system, which the local crones predict will Do Things to the cows' milk and cause trouble at lambing time.
"Ignoring the frills, it's the usual drama of operatic jealousy. The squire's son doesn't want to marry into the Post Office, and the gamekeeper, maddened by his rejection, plots revenge. The tragedy rises to its dreadful climax when poor Sarah, strangled with parcel tape, is found hidden in a mail-bag in the Dead Letter Department. The villagers hang Partridge from the nearest telegraph pole, much to the annoyance of the linesmen. He was supposed to sing an aria while he was being hung: that is one, thing I regret missing. The squire's son takes to drink, or the Colonies, or both: and that's that.
"I'm sure you're wondering where all this is leading: please bear with me for a moment longer. The fact is that while this synthetic jealousy was being rehearsed, the real thing was going on back-stage. Fenton's friend Kendall had been spurned by the young lady who was to play Sarah Stampe. I don't think he was a particularly vindictive person, but he saw an opportunity for a unique revenge. Let us be frank and admit that college life does breed a certain irresponsibility—and in identical circumstances, how many of us would have rejected the same chance?
"I see the dawning comprehension on your faces. But we, the audience, had no suspicion when the overture started on that memorable day. It was a most distinguished gathering: everyone was there, from the Chancellor downwards. Deans and professors were two a penny: I never did discover how so many people had been bullied into coming. Now that I come to think of it, I can't remember what I was doing there myself.
"The overture died away amid cheers, and, I must admit, occasional cat-calls from the more boisterous members of the audience. Perhaps I do them an injustice: they may have been the more musical ones.
"Then the curtain went up. The scene was the village square at Doddering Sloughleigh, circa 1860. Enter the heroine, reading the postcards in the morning's mail. She comes across a letter addressed to the young squire and promptly bursts into song.
"Sarah's opening aria wasn't quite as bad as the overture, but it was grim enough. Luckily, we were to hear only the first few bars....
"Precisely. We need not worry about such details as how Kendall had talked the ingenuous Fenton into it— if, indeed, the inventor realised the use to which his device was being applied. All I need say is that it was a most convincing demonstration. There was a sudden, deadening blanket of silence, and Sarah Stampe just faded out like a TV programme when the sound is turned off. Everyone was frozen hi their seats, while the singer's lips went on moving silently. Then she too realised what had happened. Her mouth opened in what would 'have been a piercing scream in any other circumstances, and she fled into the wings amid a shower of postcards.
"Thereafter, the chaos was unbelievable. For a few minutes everyone must have thought they had lost the sense of hearing, but soon they were able to tell from the behavior of their companions that they were not alone in their deprivation. Someone in the Physics Department must have realised the truth fairly promptly, for soon little slips of paper were circulating among the V.I.P.'s in the front row. The Vice-Chancellor was rash enough to try and restore order by sign-language, waving frantically to the audience from the stage. By this time I was too sick with laughter to appreciate such fine details.
"There was nothing for it but to get out of the hall, which we all did as quickly as we could. I think Kendall had fled—he was so overcome by the effect of the gadget that he didn't stop to switch it off. He was afraid of staying around in case he was caught and lynched. As for Fenton—alas, we shall never know his side of the story. We can only reconstruct the subsequent events from the evidence that was left.
"As I picture it, he must have waited until the hall was empty, and then crept in to disconnect his apparatus. We heard the explosion all over the college."
"The explosion?" someone gasped.
"Of course. I shudder to think what a narrow escape we all had. Another dozen decibels, a few more phons— and it might have happened while the theatre was still packed. Regard it, if you like, as an example of the inscrutable workings of providence that only the inventor was caught in the explosion. Perhaps it was as well: at least he perished in the moment of achievement, and before the Dean could get at him."
"Stop moralizing, man. What happened?"
"Well, I told you that Fenton was very weak on theory. If he'd gone into the mathematics of the Silencer he'd have found his mistake. The trouble is, you see, that one can't destroy energy. Not even when you cancel put one train of waves by another. All that happens then is that the energy you've neutralized accumulates somewhere else. It's rather like sweeping up all the dirt in a room—at the cost of an unsightly pile under the carpet.
"When you look into the theory of the thing, you'll find that Fenton's gadget wasn't a silencer so much as a collector of sound. All the time it was switched on, it was really absorbing sound energy. And at that concert, it was certainly going flat out. You'll understand what I mean if you've ever looked at one of Edward England's scores. On top of that, of course, there
was all the noise the audience was making—or I should say was trying to make—• during the resultant panic. The total amount of energy must have been terrific, and the poor Silencer had to keep on sucking it up. Where did it go? Well, I don't know the circuit details—probably into the condensers of the power pack. By the time Fenton started to tinker with it again, it was like a loaded bomb. The sound of his approaching footsteps was the last straw, and the overloaded apparatus could stand no more. It blew up."
For a moment no-one said a word, perhaps as a token of respect for the late Mr. Fenton. Then Eric Maine, who for the last ten minutes had been muttering in the corner over his calculations, pushed his way through the ring of listeners. He held a sheet of paper thrust aggressively in front of him.
"Hey!" he said. "I was right all the time. The thing couldn't work. The phase and amplitude relations...." Purvis waved him away.
"That's just what I've explained," he said patiently. "You should have been listening. Too bad that Fenton found out the hard way."
He glanced at his watch. For some reason, he now seemed hi a hurry to leave.
"My goodness! Tune's getting on. One of these days, remind me to tell you about the extraordinary thing we saw through the new proton microscope. That's an even more remarkable story."
He was half way through the door before anyone else could challenge him. Then George Whitley recovered his breath.
"Look here," he said hi a perplexed voice. "How is it that we never heard about this business?"
Purvis paused on the threshold, his pipe now burbling briskly as it got into its stride once more. He glanced back over his shoulder.
"There was only one thing to do," he replied. "We didn't want a scandal—de mortuis nil nisi bonum, you know. Besides, in the circumstances, don't you think it was highly appropriate to—ah—hush the whole business up? And a very good night to you all."
BIG GAME HUNT
ALTHOUGH BY general consent Harry Purvis stands unrivalled among the "White Hart" clientele as a purveyor of remarkable stories (some of which, we suspect, may be slightly exaggerated) it must not be thought that his position has never been challenged. There have even been occasions when he has gone into temporary eclipse. Since it is always entertaining to watch the discomfiture of an expert, I must confess that I take a certain glee in recalling how Professor Hinckelberg disposed of Harry on his own home ground.
Many visiting Americans pass through the "White Hart" in the course of the year. Like the residents, they are usually scientists or literary men, and some distinguished names have been recorded hi the visitors' book that Drew keeps behind the bar. Sometimes the newcomers arrive under their own power, diffidently introducing themselves as soon as they have the opportunity. (There was the time when a shy Nobel Prize winner sat unrecognized in a corner for an hour before he plucked up enough courage to say who he was.) Others arrive with letters of introduction, and not a few are escorted hi by regular customers and then thrown to the wolves.
Professor Hinckelberg glided up one night in a vast fish-tailed Cadillac he'd borrowed from the fleet hi Grosvenor Square. Heaven only knows how he had managed to insinuate it through the side streets that lead to the "White Hart", but amazingly enough all the fenders seemed intact. He was a large lean man, with that Henry-Ford-Wilbur-Wright kind of face that usually goes with the slow, taciturn speech of the sun-tanned pioneer. It didn't in Professor Hinckelberg's case. He could talk like an L.P. record on a 78 turntable. In about ten seconds we'd discovered that he was a zoologist on leave of absence from a North Virginia college, that he was attached to the Office of Naval Research on some project to do with plankton, that he was tickled pink with London and even liked English beer, that he'd heard about us through a letter in Science but couldn't believe we were true, that Stevenson was O.K. but if the Democrats wanted to get back they'd better import Winston, that he'd like to know what the heck was wrong with all our telephone call boxes and could he retrieve the small fortune in coppers of which they had mulcted him, that there seemed to be a lot of empty glasses around and how about filling them up, boys?
On the whole the Professor's shock-tactics were well received, but when he made a momentary pause for breath I thought to myself "Harry'd better look out. This guy can talk rings round him." I glanced at Purvis, who was only a few feet away from me, and saw that his lips were pursed into a slight frown. I sat back luxuriously and awaited results.
As it was a fairly busy evening, it was quite sometime before Professor Hinckelberg had been introduced to everybody. Harry, usually so forward at meeting celebrities, seemed to be keeping out of the way. But eventually he was cornered by Arthur Vincent, who acts as informal club secretary and makes sure that everyone signs the visitors' book.
"I'm sure you and Harry will have a lot to talk about" said Arthur, in a burst of innocent enthusiasm. "You're both scientists, aren't you? And Harry's had some most extraordinary things happen to him. Tell the Professor about the time you found that U 235 in your letterbox...."
"I don't think," said Harry, a trifle too hastily, "that Professor—ah—Hinckelberg wants to listen to my little adventure. I'm sure he must have a lot to tell us."
I've puzzled my head about that reply a good deal since then. It wasn't in character. Usually, with an opening like this, Purvis was up and away. Perhaps he was seizing up the enemy, waiting for the Professor to make the first mistake, and then swooping in to the kill. If that was the explanation, he'd misjudged his man. He never had a chance, for Professor Hinckelberg made a jet-assisted take-off and was immediately in full flight.
"Odd you should mention that," he said. "I've just been dealing with a most remarkable case. It's one of these things that can't be written up as a proper scientific paper, and this seems a good tune to get it off my chest. I can't often do that, because of this darned security—but so far no-one's gotten round to classifying Dr. Grinnell's experiments, so I'll talk about them while I can."
Grinnell, it seemed was one of the many scientists trying to interpret the behaviour of the nervous system in terms of electrical circuits. He had started, as Grey Walter, Shannon and others had done, by making models that could reproduce the simpler actions of living creatures. His greatest success in this direction had been a mechanical cat that could chase mice and could land on its feet when dropped from a height. Very quickly, however, he had branched off in another direction owing to his discovery of what he called "neural induction". This was, to simplify it greatly, nothing less than a method of actually controlling the behaviour of animals.
It had been known for many years that all the processes that take place in the mind are accompanied by the production of minute electric currents, and for a long time it has been possible to record these complex fluctuations —though their exact interpretation is still unknown. Grinnell had not attempted the intricate task of analysis; what he had done was a good deal simpler, though its achievement was still complicated enough. He had attached his recording device to various animals, and thus been able to build up a small library, if one could call it that, of electrical impulses associated with their behaviour. One pattern of voltage might correspond to a movement to the right, another with traveling in a circle, another with complete stillness, and so on. That was an interesting enough achievement, but Grinnell had not stopped there. By "playing back" the impulses he had recorded, he could compel his subjects to repeat their previous actions— whether they wanted to or not. That such a thing might be possible in theory almost any neurologist would admit, but few would have believed that it could be done in practice owing to the enormous complexity of the nervous system. And it was true that Grinnell's first experiments were carried out on very low forms of life, with relatively simple responses.
"I saw only one of his experiments," said Hinckelberg. "There was a large slug crawling on a horizontal piece of glass, and half a dozen tiny wires led from it to a control panel which Grinnell was operating. There were two dials —that was all—and by suitable
adjustments he could make the slug move hi any direction. To a layman, it would have seemed a trivial experiment, but I realised that it might have tremendous implications. I remember telling Grinnell that I hoped his device could never be applied to human beings. I'd been reading Orwell's "1984" and I could just imagine what Big Brother would do with a gadget like this.
"Then, being a busy man, I forgot all about the matter for a year. By the end of that time, it seems, Grinnell had improved his apparatus considerably and had worked up to more complicated organisms, though for technical reasons he had restricted himself to invertebrates. He had now built up a substantial store of 'orders' which he could then play back to his subjects. You might think it surprising that such diverse creatures as worms, snails, insects, crustaceans and so on would be able to respond to the same electrical commands, but apparently that was the case.
"If it had not been for Dr. Jackson, Grinnell would probably have stayed working away in the lab for the rest of his life, moving steadily up the animal kingdom. Jackson was a very remarkable man—I'm sure you must have seen some of his films. In many circles he was regarded as a publicity-hunter rather than a real scientist, and academic circles were suspicious of him because he had far too many interests. He'd led expeditions into the Gobi Desert, up the Amazon, and had even made one raid on the Antarctic. From each of these trips he had returned with a best-selling book and a few miles of Kodachrome.