The Radio Boys' First Wireless Part 6

CHAPTER VII

IN THE DARK

"Now," continued Dr. Dale, as he glanced round the circle of eager faces, alight with interest in the subject, "we're getting pretty close to the time when one picks up the receiver and begins to listen in.

"But as the electric vibrations, if left alone, would have a good deal of trouble in pa.s.sing through the telephone receiver, we must have a condenser to help them out. This is very easily made by gluing a piece of tinfoil about one and a half inches square to each side of a sheet of mica. Then you must have two strips of tinfoil, one extending from each side of the mica. If you haven't any mica, a sheet of ordinary writing paper will do, though the mica is better.

"The telephone receiver you will have to buy, as a satisfactory one can't very well be made by an amateur. The receiver ought to have a high resistance to get the best results.

"There," he said, as he laid the telephone receiver on the bench, "those are the essential things you have to have in order to make a set of your own. With these things only, it will of course be a simple set and have a limited range. There are a hundred improvements of one kind or another that you'll learn about as you get more expert, and these can be added from time to time. But the special thing I wanted to prove to you to-day was that it would take only a very small expenditure of money to get this material together. You see how many things I've used that any one of you can find about the house, such as tinfoil, curtain poles, curtain rings, wood for the box, and so on.

The wire needed for your tuning coil and your aerial can be obtained for less than a dollar. The detector, including the crystal, can be got for another dollar. An excellent receiver can be bought for two dollars. A few minor things will be needed at perhaps five or ten cents each. Altogether the cost of the set can be brought within five dollars."

This was good news to the boys, many of whom began at once a mental calculation as to the amount of their pocket money, while others began to figure on odd jobs that might bring them in the required amount, in the event that their parents would not supply the money.

With a few deft movements the doctor attached the various parts of the apparatus to their proper places on the baseboard. There was not time that day to put up the aerial, but he gave them practical ill.u.s.trations of how to use the detector by pressing the point of the wire firmly against the crystal, how to slide the rings back and forth until they found the point of greatest loudness and clearness, and all other points essential to using the set successfully. Not all the boys caught on to all that was involved, but to the majority it was made reasonably clear. To Bob and Joe, who had followed every point of the demonstration with the keenest attention, the operation of the receiving set was made as clear as crystal, and they had no doubt of their ability to construct a set for themselves. Herb's attention had wandered somewhat, because in the back of his mind there still lurked the idea of buying a set ready made. Jimmy had been somewhat distracted by looking about in various parts of the barn to see if he could detect the presence of any "eats," and his ideas were somewhat hazy in consequence.

"Well, boys," at last said the doctor, with a smile, "I guess we'll call it a day. But remember that if at any time you are puzzled and want more information all you have to do is to come and ask me. I'll gladly lay aside my work any time to help you youngsters out."

The boys thoroughly appreciated the doctor's cordiality and the demonstration that he had given them, and most of them took occasion to tell him so as they said good-bye to him and filed out of the extemporized workshop.

"He certainly does make things clear," said Bob enthusiastically, as he and his friends made their way toward their homes.

"Not only that, but he makes you want to do them," said Joe. "After seeing and hearing him this afternoon, I'd ten times rather make a set than buy one."

Jimmy agreed with them, and even Herb seemed ready to reconsider the idea of getting one ready made, though he was not yet quite prepared to surrender.

"All of you come over to my house to-night," said Bob, as they neared their homes. "We haven't got the materials yet, but we can go over again what the doctor told us to-day and make sure that we've got it all straight in our minds. What one forgets, the other may remember.

Then when we do get the stuff we can put a little snap and speed into making the set."

"That will be bully," replied Joe, and the others agreed with him.

"For my part," Joe continued, "I count every day lost that we have to go without it. I sure am becoming a radio fan."

It turned out that Herb was prevented from coming by unexpected company but the others were there. Their talk that night was animated and enthusiastic, so much so in fact that the time pa.s.sed more quickly than they imagined, and they were surprised when the clock struck eleven.

"By the way," said Jimmy, as he was preparing to leave with the rest, "I had a run in with Buck Looker when I was coming here to-night, and he said he was going to lay for me and do me up."

"He did, did he?" asked Bob. "What was he sore about?"

"Oh, he's had a grouch ever since the day of the fire," replied Jimmy.

"You remember that when he spoke of the work he'd been doing to help put out the fire, I spoke up and said that he hadn't done a thing.

He's had it in for me ever since. He b.u.mped against me on purpose to-night just as I was coming in the gate, and when I called him down for it he said he was going to lay for me and change my face."

"The big bully!" exclaimed Bob. "Just wait here a minute while I go into the next room."

The adjoining room was dark and commanded a view of the street in front, while Bob himself could look out of the window without being seen. Some large shade trees were on the other side of the street, and as Bob's eyes became accustomed to the darkness, he could dimly descry three forms lurking in the shadows. One of them he felt sure was Buck, and he felt reasonably certain that the others were Carl Lutz and Terrence Mooney, Buck's boon companions.

"I guess Buck and his gang are hanging around all right," he announced, as he returned to the other room and reported his discovery. "But he's going to get a little surprise party. I tell you what we'll do. You go out of the front door alone, Jimmy. Joe and I will stand there in the light from the hall lamp and say good-night.

Then we'll close the door, and you stand on the stoop a minute, b.u.t.toning your coat, and then go slowly down the walk. That will give Joe and me a chance to slip around through the back in the darkness and get behind the bushes near the gate. Leave the rest to us."

"And what we'll do will be a plenty," added Joe.

Jimmy thought well of this plan, and agreed to do his part.

They followed out this program to the letter. As Jimmy came down the walk, the lurking figures across the street came out from the shadow of the trees and over toward him.

"I've got you now, Jimmy Plummer," snarled the voice of Buck Looker.

"I told you I was going to take some of the freshness out of you, and now I'm going to tan your hide."

"Does it take three of you to do it?" asked Jimmy.

"None of your lip now," growled Buck, as he clenched his fist.

"I'm going to have the fun of doing it myself."

With one spring Bob vaulted over the low fence.

"You've got another guess coming, Buck Looker," he said coolly.

The bully started back in surprise and consternation, which was not diminished when Joe followed his friend's example and stood at his side.

"What are you b.u.t.ting in for?" Buck snapped, as soon as he recovered his breath.

"Because I choose to," answered Bob. "Because I won't stand by and see you hit a fellow half your size. If it's fighting you're looking for, I'll give you all the fighting you want right here and now. If your gang want to mix in, Joe will take care of Lutz and Jimmy can look after Mooney. But I'll take you on myself. How about it? Is it a go?"

He advanced on Buck, and before his flas.h.i.+ng eyes those of the bully wavered and fell.

"I--I'll settle with you some other time," he stammered, retreating toward the middle of the street.

"No time like the present," challenged Bob, but as Buck, muttering threats, still continued to retreat, while his cronies slunk away with him, Bob gave a little laugh and came back to his friends.

"All right, Jimmy," he chuckled. "I guess your face won't be changed to-night. Buck seems to have changed his mind."

CHAPTER VIII

GETTING A START

The idea of having their own radio outfit and being able to hear all the wonderful things going on in the air about them so fascinated the boys that they could talk or think of little else. Even Jimmy Plummer became so excited that his mother declared he was actually forgetting to eat, a statement that his father flatly refused to believe at first, until he escorted his rotund son to the nearest scale and discovered the astonis.h.i.+ng fact that he had really lost two pounds.

"You see how it is, Dad," said Jimmy, mournfully. "If you don't give me the money to get some wireless stuff I'll just pine away and die."

"It wouldn't hurt you to pine away about twenty pounds, anyway," said his father, with a twinkle in his eye. "But I suppose if you've set your heart on it I might as well come across now as later and save myself from being pestered to death. How much do you suppose you'll need to get started?"

"The other fellows are figuring that about five dollars apiece will buy most of the things we'll need--at first, anyway," he added, with a careful eye to the future.