by Unknown
"Where do we go, Doctor?" asked Carnes as the truck rolled off.
"To the Blackstone Hotel for a bath and some clean clothes," replied the doctor. "And now, what is the news you have for me?"
"The news is this, Doctor. I carried out your instructions diligently and, during the daylight hours, the lions have not moved."
* * * * *
Dr. Bird looked contrite.
"I beg your pardon, Carnes," he said. "I really didn't think when I left you so mystified how you must have felt. Believe me, I had my own reasons, excellent ones, for secrecy."
"I have usually been able to maintain silence when asked to," replied Carnes stiffly.
"My dear fellow, I didn't mean to question your discretion. I know that whatever I tell you is safe, but there are angles to this affair that are so weird and improbable that I don't dare to trust my own conclusions, let alone share them. I'll tell you all about it soon. Did you get those tickets I wired for?"
"Of course I got them, but what have two tickets to the A. A. U. track meet this afternoon got to do with a bank robbery?"
"One trouble with you, Carnes," replied the doctor with a judicial air, "is that you have no idea of the importance of proper relaxation. Is it possible that you have no desire to see Ladd, this new marvel who is smashing records right and left, run? He performs for the Illinois Athletic Club this afternoon, and it would not surprise me to see him lower the world's record again. He has already lowered the record for the hundred yard dash from nine and three-fifths to eight and four-fifths. There is no telling what he will do."
"Are we going to waste the whole afternoon just to watch a man run?" demanded Carnes in disgust.
"We will see many men run, my dear fellow, but there is only one in whom I have a deep abiding interest, and that is Mr. Ladd. Have you your binoculars with you?"
"No."
"Then by all means beg, borrow or steal two pairs before this afternoon. We might easily miss half the fun without them. Are our seats near the starting line for the sprints?"
"Yes. The big demand was for seats near the finish line."
"The start will be much more interesting, Carnes. I was somewhat of a minor star in track myself in my college days and it will be of the greatest interest to me to observe the starting form of this new speed artist. Now Carnes, don't ask any more questions. I may be barking up the wrong tree and I don't want to give you a chance to laugh at me. I'll tell you what to watch for at the track."
* * * * *
The sprinters lined up on the hundred yard mark and Dr. Bird and Carnes sat with their glasses glued to their eyes watching the slim figure in the colors of the Illinois Athletic Club, whose large "62" on his back identified him as the new star.
"On your mark!" cried the starter. "Get set!"
"Ah!" cried Dr. Bird. "Did you see that Carnes?"
The starting gun cracked and the runners were off on their short grind. Ladd leaped into the lead and rapidly distanced the field, his legs twinkling under him almost faster than the eye could follow. He was fully twenty yards in the lead when his speed suddenly lessened and the balance of the runners closed up the gap he had opened. His lead was too great for them, and he was still a good ten yards in the lead when he crossed the tape. The official time was posted as eight and nine-tenths seconds.
"Another thirty yards and he would have been beaten," said Carnes as he lowered his glasses.
"That is the way he has won all of his races," replied the doctor. "He piles up a huge lead at first and then loses a good deal at the finish. His speed doesn't hold up. Never mind that, though, it is only an additional point in my favor. Did you notice his jaws just before the gun went?"
"They seemed to clench and then he swallowed, but most of them did some thing like that."
"Watch him carefully for the next heat and see if he puts anything into his mouth. That is the important thing."
Dr. Bird sank into a brown study and paid no attention to the next few events, but he came to attention promptly when the final heat of the hundred yard dash was called. With his glasses he watched Ladd closely as the runner trotted up to the starting line.
"There, Carnes!" he cried suddenly. "Did you see?"
"I saw him wipe his mouth," said Carnes doubtfully.
"All right, now watch his jaws just before the gun goes."
* * * * *
The final heat was a duplicate of the first preliminary. Ladd took an early lead which he held for three-fourths of the distance to the tape, then his pace slackened and he finished only a bare ten yards ahead of the next runner. The time tied his previous world's record of eight and four-fifths seconds.
"He crunched and swallowed all right, Doctor," said Carnes.
"That is all I wanted to be sure of. Now Carnes, here is something for you to do. Get hold of the United States Commissioner and get a John Doe warrant and go back to the hotel with it and wait for me. I may phone you at any minute and I may not. If I don't, wait in your room until you hear from me. Don't leave it for a minute."
"Where are you going, Doctor?"
"I'm going down and congratulate Mr. Ladd. An old track man like me can't let such an opportunity pass."
"I don't know what this is all about, Doctor," replied Carnes, "but I know you well enough to obey orders and to keep my mouth shut until it is my turn to speak."
Few men could resist Dr. Bird when he set out to make a favorable impression, and even a world's champion is apt to be flattered by the attention of one of the greatest scientists of his day, especially when that scientist has made an enviable reputation as an athlete in his college days and can talk the jargon of the champion's particular sport. Henry Ladd promptly capitulated to the charm of the doctor and allowed himself to be led away to supper at Bird's club. The supper passed off pleasantly, and when the doctor requested an interview with the young athlete in a private room, he gladly consented. They entered the room together, remained for an hour and a half, and then came out. The smile had left Ladd's face and he appeared nervous and distracted. The doctor talked cheerfully with him but kept a firm grip on his arm as they descended the stairs together. They entered a telephone booth where the doctor made several calls, and then descended to the street, where they entered a taxi.
"Maywood airdrome," the doctor told the driver.
* * * * *
Two hours later the big Martin bomber which had carried the doctor to Chicago roared away into the night, and Bird turned back, reentered the taxi, and headed for the city alone.
When Carnes received the telephone call, which was one of those the doctor made from the booth in his club, he hurried over to the First National Bank. His badge secured him an entrance and he found Casey busily engaged in rigging up an elaborate piece of apparatus on one of the balconies where guards were normally stationed during banking hours.
"Dr. Bird said to tell you to keep on the job all night if necessary," he told Casey. "He thinks he will need your machine to-morrow."
"I'll have it ready to turn on the power at four A.M.," replied Casey.
Carnes watched him curiously for a while as he soldered together the electrical connections and assembled an apparatus which looked like a motion picture projector.
"What are you setting up?" he asked at length.
"It is a high speed motion picture camera," replied Casey, "with a telescopic lens. It is a piece of apparatus which Dr. Bird designed while he was in Washington last week and which I made from his sketches, using some apparatus we had on hand. It's a dandy, all right."
"What is special about it?"
"The speed. You know how fast an ordinary movie is taken, don't you? No? Well, it's sixteen exposures per second. The slow pictures are taken sometimes at a hundred and twenty-eight or two hundred and fifty-six exposures per second, and then shown at sixteen. This affair will take half a million pictures per second."
"I didn't know that a film would register with that short an exposure."
* * *
* *
"That's slow," replied Casey with a laugh. "It all depends on the light. The best flash-light powder gives a flash about one ten-thousandth of a second in duration, but that is by no means the speed limit of the film. The only trouble is enough light and sufficient shutter speed. Pictures have been taken by means of spark photography with an exposure of less than one three-millionth of a second. The whole secret of this machine lies in the shutter. This big disc with the slots in the edge is set up before the lens and run at such a speed that half a million slots per second pass before the lens. The film, which is sixteen millimeter X-ray film, travels behind the lens at a speed of nearly five miles per second. It has to be gradually worked up to this speed, and after the whole thing is set up, it takes it nearly four hours to get to full speed."
"At that speed, it must take a million miles of film before you get up steam."
"It would, if the film were being exposed. There is only about a hundred yards of film all told, which will run over these huge drums in an endless belt. There is a regular camera shutter working on an electric principle which remains closed. When the switch is tripped, the shutter opens in about two thirty-thousandths of a second, stays open just one one-hundredth of a second, and then closes. This time is enough to expose nearly all of our film. When we have our picture, I shut the current down, start applying a magnetic brake, and let it slow down. It takes over an hour to stop it without breaking the film. It sounds complicated, but it works all right."
"Where is your switch?"
* * * * *
"That is the trick part of it. It is a remote control affair. The shutter opens and starts the machine taking pictures when the back door of the paying teller's cage is opened half an inch. There is also a hand switch in the line that can be opened so that you can open the door without setting off the camera, if you wish. When the hand switch is closed and the door opened, this is what happens. The shutter on the camera opens, the machine takes five thousand pictures during the next hundredth of a second, and then the shutter closes. Those five thousand exposures will take about five minutes to show at the usual rate of sixteen per second."
"You said that you had to get plenty of light. How are you managing that?"
"The camera is equipped with a special lens ground out of rock crystal. This lens lets in ultra-violet light which the ordinary lens shuts out, and X-ray film is especially sensitive to ultra-violet light. In order to be sure that we get enough illumination, I will set up these two ultra-violet floodlights to illumine the cage. The teller will have to wear glasses to protect his eyes and he'll get well sunburned, but something has to be sacrificed to science, as Dr. Bird is always telling me."
"It's too deep for me," said Carnes with a sigh. "Can I do anything to help? The doctor told me to stand by and do anything I could."
"I might be able to use you a little if you can use tools," said Casey with a grin. "You can start bolting together that light proof shield if you want to."
* * * * *
"Well, Carnes, did you have an instructive night?" asked Dr. Bird cheerfully as he entered the First National Bank at eight-thirty the next morning.
"I don't see that I did much good, Doctor. Casey would have had the machine ready on time anyway, and I'm no machinist."
"Well, frankly, Carnes, I didn't expect you to be of much help to him, but I did want you to see what Casey was doing, and a little of it was pretty heavy for him to handle alone. I suppose that everything is ready?"
"The motor reached full speed about fifteen minutes ago and Casey went out to get a cup of coffee. Would you mind telling me the object of the whole thing?"
"Not at all. I plan to make a permanent record of the work of the most ingenious bank robber in the world. I hope he keeps his word."
"What do you mean?"
"Three days ago when Sturtevant sweated a 'confession' out of poor Winston, the bank got a message that the robbery would be repeated this morning and dared them to prevent it. Rogers thought it was a hoax, but he telephoned me and I worked the Bureau men night and day to get my camera ready in time for him. I am afraid that I can't do much to prevent the robbery, but I may be able to take a picture of it and thus prevent other cases of a like nature."
"Was the warning written?"
"No. It was telephoned from a pay station in the loop district, and by the time it was traced and men got there, the telephoner was probably a mile away. He said that he would rob the same cage in the same manner as he did before."
"Aren't you taking any special precautions?"
"Oh, yes, the bank is putting on extra guards and making a lot of fuss of that sort, probably to the great amusement of the robber."
"Why not close the cage for the day?"
"Then he would rob a different one and we would have no way of photographing his actions. To be sure, we will put dummy money there, bundles with bills on the outside and paper on the inside, so if I don't get a picture of him, he won't get much. Every bill in the cage will be marked as well."
"Did he say at what time he would operate?"
"No, he didn't, so we'll have to stand by all day. Oh, hello, Casey, is everything all right?"
"As sweet as chocolate candy, Doctor. I have tested it out thoroughly, and unless we have to run it so long that the film wears out and breaks, we are sitting pretty. If we don't get the pictures you are looking for, I'm a dodo, and I haven't been called that yet."
"Good work, Casey. Keep the bearings oiled and pray that the film doesn't break."
* * * * *
The bank had been opened only ten minutes when the clangor of gongs announced a robbery. It was practically a duplicate of the first. The paying teller had turned from his window to take some bills from his rack and had found several dozens of bundles missing. As the gongs sounded, Dr. Bird and Casey leaped to the camera.
"She snapped, Doctor!" cried Casey as he threw two switches. "It'll take an hour to stop and half a day to develop the film, but I ought to be able to show you what we got by to-night."
"Good enough!" cried Dr. Bird. "Go ahead while I try to calm down the bank officials. Will you have everything ready by eight o'clock?"
"Easy, Doctor," replied Casey as he turned to the magnetic brake.
By eight o'clock quite a crowd had assembled in a private room at the Blackstone Hotel. Besides Dr. Bird and Carnes, Rogers and several other officials of the First National Bank were present, together with Detective-Captain Sturtevant and a group of the most prominent scientists and physicians gathered from the schools of the city.
"Gentlemen," said Dr. Bird when all had taken seats facing a miniature moving picture screen on one wall, "to-night I expect to show you some pictures which will, I am sure, astonish you. It marks the advent of a new departure in transcendental medicine. I will be glad to answer any questions you may wish to ask and to explain the pictures after they are shown, but before we start a discussion, I will ask that you examine what I have to show you. Lights out, please!"
He stepped to the rear of the room as the lights went out. As his eyes grew used to the dimness of the room he moved forward and took a vacant seat. His hand fumbled in his pocket for a second.
"Now!" he cried suddenly.
In the momentary silence which followed his cry, two dull metallic clicks could be heard, and a quick cry that was suddenly strangled as Dr. Bird clamped his hand over the mouth of the man who sat between him and Carnes.
"All right, Casey," called the doctor.
* * * * *
The whir of a projection machine could be heard and on the screen before them leaped a picture of the paying teller's cage of the First National Bank. Winston's successor was standing motionless at the wicket, his lips parted in a smile, but the attention of all was riveted on a figure who moved at the back of the cage. As the picture started, the figure was bent over an opened suitcase, stuffing into it bundles of bills. He straightened up and reached to the rack for more bills, and as he did so he faced the camera f
ull for a moment. He picked up other bundles of bills, filled the suitcase, fastened it in a leisurely manner, opened the rear door of the cage and walked out.
"Again, please!" called Dr. Bird. "And stop when he faces us full."
The picture was repeated and stopped at the point indicated.
"Lights, please!" cried the doctor.
The lights flashed on and Dr. Bird rose to his feet, pulling up after him the wilted figure of a middle-aged man.
"Gentlemen," said the doctor in ringing tones, "allow me to present to you Professor James Kirkwood of the faculty of the Richton University, formerly known as James Collier of the Bureau of Standards, and robber of the First National Bank."
Detective-Captain Sturtevant jumped to his feet and cast a searching glance at the captive.
"He's the man all right," he cried. "Hang on to him until I get a wagon here!"
"Oh, shut up!" said Carnes. "He's under federal arrest just now, charged with the possession of narcotics. When we are through with him, you can have him if you want him."
"How did you get that picture, Doctor?" cried the cashier. "I watched that cage every minute during the morning and I'll swear that man never entered and stole that money as the picture shows, unless he managed to make himself invisible."
* * * * *
"You're closer to the truth than you suspect, Mr. Rogers," said Dr. Bird. "It is not quite a matter of invisibility, but something pretty close to it. It is a matter of catalysts."
"What kind of cats?" asked the cashier.
"Not cats, Mr. Rogers, catalysts. Catalysts is the name of a chemical reaction consisting essentially of a decomposition and a new combination effected by means of a catalyst which acts on the compound bodies in question, but which goes through the reaction itself unchanged. There are a great many of them which are used in the arts and in manufacturing, and while their action is not always clearly understood, the results are well known and can be banked on.
"One of the commonest instances of the use of a catalyst is the use of sponge platinum in the manufacture of sulphuric acid. I will not burden you with the details of the 'contact' process, as it is known, but the combination is effected by means of finely divided platinum which is neither changed, consumed or wasted during the process. While there are a number of other catalysts known, for instance iron in reactions in which metallic magnesium is concerned, the commonest are the metals of the platinum group.
