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For the remainder of the afternoon Kennedy remained pondering the case.
At last an idea seemed to dawn on him. He found Herndon still at his office and made an appointment to meet on the waterfront near La Montaigne's pier, after dinner. The change in Kennedy's spirits was obvious, though it did not in the least enlighten my curiosity. Even after a dinner which was lengthened out considerably, I thought, I did not get appreciably nearer a solution, for we strolled over to the laboratory, where Craig loaded me down with a huge package which was wrapped up in heavy paper.
We arrived on the corner opposite the wharf just as it was growing dusk. The neighbourhood did not appeal to me at night, and even though there were two of us I was rather glad when we met Herndon, who was waiting in the shadow of a fruit stall.
But instead of proceeding across to the pier by the side of which La Montaigne was moored, we cut across the wide street and turned down the next pier, where a couple of freighters were lying. The odour of salt water, sewage, rotting wood, and the night air was not inspiring.
Nevertheless I was now carried away with the strangeness of our adventure.
Halfway down the pier Kennedy paused before one of the gangways that was shrouded in darkness. The door was opened and we followed gingerly across the dirty deck of the freight ship. Below we could hear the water lapping the piles of the pier. Across a dark abyss lay the grim monster La Montaigne with here and there a light gleaming on one of her decks. The sounds of the city seemed miles away.
"What a fine place for a murder," laughed Kennedy coolly. He was unwrapping the package which he had taken from me. It proved to be a huge reflector in front of which was placed a little arrangement which, under the light of a shaded lantern carried by Herndon, looked like a coil of wire of some kind.
To the back of the reflector Craig attached two other flexible wires which led to a couple of dry cells and a cylinder with a broadened end, made of vulcanised rubber. It might have been a telephone receiver, for all I could tell in the darkness.
While I was still speculating on the possible use of the enormous parabolic reflector, a slight commotion on the opposite side of the pier distracted my attention. A ship was coming in and was being carefully and quietly berthed alongside the other big iron freighter on that side. Herndon had left us.
"The Mohican is here," he remarked as he rejoined us. To my look of inquiry he added, "The revenue cutter."
Kennedy had now finished and had pointed the reflector full at La Montaigne. With a whispered hasty word of caution and advice to Herndon, he drew me along with him down the wharf again.
At the little door which was cut in the barrier guarding the sh.o.r.e end of La Montaigne's wharf Kennedy stopped. The customs service night watchman--there is always a watchman of some kind aboard every ship, pa.s.senger or freighter, all the time she is in port--seemed to understand, for he admitted us after a word with Kennedy.
Threading our way carefully among the boxes, and bales, and crates which were piled high, we proceeded down the wharf. Under the electric lights the longsh.o.r.emen were working feverishly, for the unloading and loading of a giant trans-Atlantic vessel in the rush season is a long and tedious process at best, requiring night work and overtime, for every moment, like every cubic foot of s.p.a.ce, counts.
Once within the door, however, no one paid much attention to us. They seemed to take it for granted that we had some right there. We boarded the ship by one of the many entrances and then proceeded down to a deck where apparently no one was working. It was more like a great house than a ship, I felt, and I wondered whether Kennedy's search was not more of a hunt for a needle in a haystack than anything else. Yet he seemed to know what he was after.
We had descended to what I imagined must be the quarters of the steward. About us were many large cases and chests, stacked up and marked as belonging to the ship. Kennedy's attention was attracted to them immediately. All at once it flashed on me what his purpose was. In some of those cases were the smuggled goods!
Before I could say a word and before Kennedy had a chance even to try to verify his suspicions, a sudden approach of footsteps startled us.
He drew me into a cabin or room full of shelves with ship's stores.
"Why didn't you bring Herndon over and break into the boxes, if you think the stuff is hidden in one of them?" I whispered.
"And let those higher up escape while their tools take all the blame?"
he answered. "Sh-h."
The men who had come into the compartment looked about as if expecting to see some one.
"Two of them came down," a gruff voice said. "Where are they?"
From the noise I inferred that there must be four or five men, and from the ease with which they shifted the cases about some of them must have been pretty husky stevedores.
"I don't know," a more polished but unfamiliar voice answered.
The door to our hiding-place was opened roughly and then banged shut before we realised it. With a taunting laugh, some one turned a key in the lock and before we could move a quick shift of packing cases against the door made escape impossible.
Here we were marooned, shanghaied, as it were, within sight if not call of Herndon and our friends. We had run up against professional smugglers, of whom I had vaguely read, disguised as stewards, deckhands, stokers, and other workers.
The only other opening to the cabin was a sort of porthole, more for ventilation than anything else. Kennedy stuck his head through it, but it was impossible for a man to squeeze out. There was one of the lower decks directly before us while a bright arc light gleamed tantalisingly over it, throwing a round circle of light into our prison. I reflected bitterly on our shipwreck within sight of port.
Kennedy remained silent, and I did not know what was working in his mind. Together we made out the outline of the freighter at the next wharf and speculated as to the location where we had left Herndon with the huge reflector. There was no moon and it was as black as ink in that direction, but if we could have got out I would have trusted to luck to reach it by swimming.
Below us, from the restless water lapping on the sides of the hulk of La Montaigne, we could now hear m.u.f.fled sounds. It was a motor-boat which had come crawling up the river front, with lights extinguished, and had pushed a cautious nose into the slip where our ship lay at the quay. None of your romantic low-lying, rakish craft of the old smuggling yarns was this, ready for deeds of desperation in the dark hours of midnight. It was just a modern little motor-boat, up-to-date, and swift.
"Perhaps we'll get out of this finally," I grumbled as I understood now what was afoot, "but not in time to be of any use."
A smothered sound as of something going over the vessel's side followed. It was one of the boxes which we had seen outside in the storeroom. Another followed, and a third and a fourth.
Then came a subdued parley. "We have two customs detectives locked in a cabin here. We can't stay now. You'll have to take us and our things off, too."
"Can't do it," called up another m.u.f.fled voice. "Make your things into a little bundle. We'll take that, but you'll have to get past the night.w.a.tchman yourselves and meet us at Riverledge."
A moment later something else went over the side, and from the sound we could infer that the engine of the motor-boat was being started.
A voice sounded mockingly outside our door. "Bon soir, you fellows in there. We're going up the dock. Sorry to leave you here till morning, but they'll let you out then. Au revoir."
Below I could hear just the faintest well-m.u.f.fled chug-chug. Kennedy in the meantime had been coolly craning his neck out of our porthole under the rays of the arc light overhead. He was holding something in his hand. It seemed like a little silver-backed piece of thin gla.s.s with a flaring funnel-like thing back of it, which he held most particularly.
Though he heard the parting taunt outside he paid no attention.
"You go to the deuce, whoever you are," I cried, beating on the door, to which only a coa.r.s.e laugh echoed back down the pa.s.sageway.
"Be quiet, Walter," ordered Kennedy. "We have located the smuggled goods in the storeroom of the steward, four wooden cases of them. I think the stuff must have been brought on the ship in the trunks and then transferred to the cases, perhaps after the code wireless message was received. But we have been overpowered and locked in a cabin with a port too small to crawl through. The cases have been lowered over the side of the ship to a motor-boat that was waiting below. The lights on the boat are out, but if you hurry you can get it. The accomplices who locked us in are going to disappear up the wharf. If you could only get the night watchman quickly enough you could catch them, too, before they reach the street."
I had turned, half expecting to see Kennedy talking to a ship's officer who might have chanced on the deck outside. There was no one. The only thing of life was the still sputtering arc light. Had the man gone crazy?
"What of it?" I growled. "Don't you suppose I know all that? What's the use of repeating it now? The thing to do is to get out of this hole.
Come, help me at this door. Maybe we can batter it down."
Kennedy paid no attention to me, however, but kept his eyes glued on the Cimmerian blackness outside the porthole.
He had done nothing apparently, yet a long finger of light seemed to shoot out into the sky from the pier across from us and begin waving back and forth as it was lowered to the dark waters of the river. It was a searchlight. At once I thought of the huge reflector which I had seen set up. But that had been on our side of the next pier and this light came from the far side where the Mohican lay.
"What is it?" I asked eagerly. "What has happened?"
It was as if a prayer had been answered from our dungeon on La Montaigne.
"I knew we should need some means to communicate with Herndon," he explained simply, "and the wireless telephone wasn't practicable. So I have used Dr. Alexander Graham Bell's photophone. Any of the lights on this side of La Montaigne, I knew, would serve. What I did, Walter, was merely to talk into the mouthpiece back of this little silvered mirror which reflects light. The vibrations of the voice caused a diaphragm in it to vibrate and thus the beam of reflected light was made to pulsate.
In other words, this little thing is just a simple apparatus to transform the air vibrations of the voice into light vibrations.
"The parabolic reflector over there catches these light vibrations and focuses them on the cell of selenium which you perhaps noticed in the centre of the reflector. You remember doubtless that the element selenium varies its electrical resistance under light? Thus there are reproduced similar variations in the cell to those vibrations here in this transmitter. The cell is connected with a telephone receiver and batteries over there--and there you are. It is very simple. In the ordinary carbon telephone transmitter a variable electrical resistance is produced by pressure, since carbon is not so good a conductor under pressure. Then these variations are transmitted along two wires. This photophone is wireless. Selenium even emits notes under a vibratory beam of light, the pitch depending on the frequency. Changes in the intensity of the light focused by the reflector on the cell alter its electrical resistance and vary the current from the dry batteries.
Hence the telephone receiver over there is affected. Bell used the photophone or radiophone over several hundred feet, Ruhmer over several miles. When you thought I was talking to myself I was really telling Herndon what had happened and what to do--talking to him literally over a beam of light."
I could scarcely believe it, but an exclamation from Kennedy as he drew his head in quickly recalled my attention. "Look out on the river, Walter," he cried. "The Mohican has her searchlight sweeping up and down. What do you see?"
The long finger of light had now come to rest. In its pathway I saw a lightless motor-boat bobbing up and down, crowding on all speed, yet followed relentlessly by the accusing finger. The river front was now alive with shouting.
Suddenly the Mohican shot out from behind the pier where she had been hidden. In spite of Lang's expertness it was an unequal race. Nor would it have made much difference if it had been otherwise, for a shot rang out from the Mohican which commanded instant respect. The powerful revenue cutter rapidly overhauled the little craft.
A hurried tread down the pa.s.sageway followed. Cases were being shoved aside and a key in the door of our compartment turned quickly. I waited with clenched fists, prepared for an attack.