nty that the threatened row was over, for the present

urn up just now," he snarled. "I was just gett

you were going to do it with your books, like the coward that you are. You gave yourself away that tim

k and his friends walked away rapidly, while Bob and Joe foll

e came abreast of them. "You seemed t

ng a little argume

he matter. If the trouble had taken place in the school or on the school premises, he would have felt it his duty to go to the bottom o

ject. "Are you boys just as enthusiastic over it a

ting so that almost every minute we have out of school we're either tinkering with our set

Preston. "I get better results wi

asked Bob, in some surprise. "I didn't h

here are more than a million of them in the United States now, and their ranks are being swelled by thousands with every day that p

ing quite a feature in e

ng of a plan that might be of help in the geography classes, for instance. Suppose some great lecturer or traveler who has been in faraway lands should give a travel talk from some broadcasting station. Then while he was describing China, for instance

," sa

ack of interest in those classes. The boys wo

et, but it's perfectly feasible and I shouldn't be

t good-bye, and the boys went on their way together,

ome curiosity, for he had witnessed the parting. "Hauling you ov

. "We just found out that he is

ured Jimmy musingly. "You couldn't throw a stone now

when he did," grumbled Joe. "I was just going

k," commented Jimmy.

ame so engrossed in it that they almost ran into Dr.

r the minister was a prime favorite with them and they always felt at their ease with him. There w

r a few minutes until t

minutes, Doctor?" asked Bob. "There are so

much that I'd rather talk about. In fact, I was just about to tel

steps and dropped into the ch

Doctor," urged Bob. "Our qu

were making the experiments. They had a radio set in there with a horn, and the set was connected with an aerial on the roof of the car. They sent out signals to various stations while the train was going along at the rate of forty miles an hour, and got replies that we c

ork to Albany, and chat with a friend who may be on another train traveling between Chicago and Denver. Or if a business man has started from New York to Chicago and happens to

c," remarked Bob, dr

w hundred years ago we'd have been burned a

e next station. A train may be coming toward it head on, or another train ahead of it and going in the same direction may be stalled. Often in the first case orders have come to the station agent to hold a train until another one has passed. But the station agent gets the m

may be foggy or dark, and the engineer of the second train doesn't see the flags and comes plunging on into the first train. With the radio, the instant a train is halted for any reason, it can send a message to the second train telling just where it i

nswer your questions, and I've been doing all the talkin