Boy Scouts in a Submarine Part 6

The door to the room where the dynamos and the gasoline engine were situated was found wide open, and Ned instructed the boys to leave it so and leave everything untouched.

"The first thing to do," he said, "is to discover any clues the a.s.sa.s.sin may have left here. It is an old theory that no person, however careful he or she may be, can enter and leave a room without leaving behind some evidence of his or her presence there. We'll soon know if this is true in this case."

"There was some one in here, all right," Jimmie said. "He pa.s.sed us on the conning tower, skipping like to break the speed limit for the city. I tried to trip him as he pa.s.sed me, an' got this."

The lad turned a bruised face toward his companions. In the confusion no one had observed the cut on his cheek.

"You did get something!" Jack exclaimed. "Why didn't you say something about it?"

"Nothin' doin'!" answered the boy. "Only a scratch!"

Notwithstanding the boy's claim that the wound was of small importance, Ned insisted on its being dressed at once.

"Now," Ned said, after the cut had been properly cared for, "what sort of a man was it that pa.s.sed you boys on the conning tower? The circular platform is so small that he must have crowded you pretty closely when he stepped out."

"He did," Jimmie answered. "I thought it was you, and stepped aside to make room for him."

"And then?"

"I had a feeling that it wasn't you. Then, he was makin' for the wharf so fast that I thought it would do no harm to have a look at him, and so called out."

"Then's when you got the slash across the cheek?"

"Yes; he cut me then."

"What about the size of the fellow?" asked Ned.

"Oh, I should think he was slender and light, the way he bounded off the platform and made for the wharf."

"Do you think he went there to kill Lieutenant Scott?" asked Jack, a moment later.

"It is more probable that he came here to put the Sea Lion out of commission," Frank replied.

"I'll bet well find somethin' all busted up!" Jimmie predicted.

"Ned can soon determine that," Jack remarked.

"Yes," Ned went on, "but the first thing to do is to see if this murderer left any visiting cards here. After that, we must notify the Coroner and have the body removed."

Ned went into the dynamo room and looked about.

"Here is where any enemy would have to do his work," he said, "so we must look for clues here. Keep your hands off the machinery, for he may have left finger marks somewhere."

Ned searched long and carefully without reward. Finally he turned to the waiting boys.

"There's quite a lot of waste lying around," he said. "Secure every fiber of it and examine it under the microscope. You would better attend to that, Frank, as you are familiar with the instrument. If you discover anything foreign to a place like this, let me know."

While Ned continued his search about the interior of the submarine, Frank busied himself inspecting the bits of waste the other boys brought to him. At last an exclamation of astonishment brought Ned to his side.

"There's something funny about this," Frank said, as Ned bent over his shoulder. "That stuff is not oil, and I'd like to know how it got in here."

"What does it look like?" asked Ned.

"I can't say," was the hesitating reply.

Ned took the microscope and looked at the object to which his attention had been called.

"Rubber!" he said, in a moment.

"Rubber!" repeated Frank. "How could rubber be in the waste in that shape?"

"All the same," Ned replied, "this is some rubber composition, and it has been wiped into the waste. Now, what could any person want with rubber here?"

"It is used quite a lot around electric apparatus," suggested Frank Shaw.

"But not in this form," Ned replied.

Then, remembering certain smooth blurs on the polished machinery he had recently examined, he took the microscope and made another examination of the spots. Presently he called Frank to his side.

"Look through the gla.s.s," he said, handing the instrument to Frank, "and tell me what you see."

"Rubber!" cried the boy, after a short examination. "There are a few traces here of the same rubber composition I found on the waste. Can you tell me what it means?"

"Quite simple," Ned replied, as the boys gathered about him. "The use of rubber composition by men engaged in nefarious undertakings dates back to the time of the utilization of the whorls and lines of the human fingers as aids in the detection of crime."

"I guess I know what you are going to say," cried Frank.

"When the thumb- and finger-print experts got busy with their photographs and their enlarged reproductions, the criminals began studying on methods to offset this dangerous aid to detective work."

"I knew it," cried Frank.

"And so," Ned went on, "they conceived the idea of filling the lines on the fingers and hands and making them perfectly smooth. This is rubber paint," he went on. "The man who was hidden in here when we came in did not care to leave any finger marks behind him."

"But he did leave smooth blurs on the machines where his fingers touched them!" said Jack.

"Certainly, and so pointed out the location of his efforts. Still, I do not think he meditated disabling the Sea Lion. It is more probable that he believed Lieutenant Scott to be the expert in charge of the boat and sought to kill or disable him."

"See where the chump wiped his hands on waste," Jimmie cried.

Ned now made a still closer inspection of the room and was rewarded for his thoroughness by discovering a tiny pool of the rubber composition on the floor, close to the giant iron frame of the big dynamo. Looking at the pool through his gla.s.s he discovered bits of wool mixed with it. He put up his gla.s.s with a smile.

"We ought to be able to find this fellow now," he said, "if we get busy before he has time to change his clothes."

"Got him, have you?" asked Jack.

"I think I could pick him out of a thousand provided he is captured in the clothes he wore while here. His hand trembled while he was putting the rubber composition on his fingers and some of it dropped on his clothing and dripped off to the floor.

"There are shreds of blue wool in this composition on the floor--so you see he wore a blue woolen garment--probably a coat or pair of trousers. And, see here, the fellow lost all caution when he bounded out of the submarine, after extinguishing the lights, on my entrance.