第10章

"Well, Tom," he asked, "another failure?""No, Dad! Success! This time I turned the trick.I seem to have gotten just the right mixture.Look, these are some of the pieces left from the big rock--one of the samples Mr.Titus sent me.It was all cracked up as small as this," and he held out the fragments he had picked up in the field.

Mr.Swift regarded them for a few moments.

"That's better, Tom," he said."I didn't think you could get an explosive that would successfully shatter that hard rock, but you seem to have done it.Have you the formula all worked out?""All worked out, Dad.I only made a small quantity, but the same proportions will hold good for the larger amounts.I'm going to start in and make it now.And then--Ho! for Peru!"Tom struck an attitude, such as some old discoverer might have assumed, and then he hurried into the house to telephone a telegram to the Shop' ton office.The message was to Mr.Titus, and read:

"Explosive success.Start making it at once.Ready for Peru in month's time.""Thirteen words," repeated Tom, as the operator called them back to him."I hope that doesn't mean bad luck."The experiment which Tom Swift had just brought to a successful conclusion was one of many he had conducted, extending over several wearying weeks.

As soon as Tom had received the samples of the rock he had begun to experiment.First he tried some of the explosive that was so successful in the giant cannon, As he had feared, it was not what was needed.It crackedthe rock, but did not disintegrate it, and that was what was needed.The hard rock must be broken up into fragments that could be easily handled.Merely to crack it necessitated further explosions, which would only serve to split it more and perhaps wedge it fast in the tunnel.

So Tom tried different mixtures, using various chemicals, but none seemed to be just right.The trials were not without danger, either.Once, in mixing some ingredients, there was an explosion that injured one man, and blew Tom some distance away.Fortunately for him, there was an open window in the direction in which he was propelled, and he went through that, escaping with only some cuts and bruises.

Another time there was a hang-fire, and the explosive burned instead of detonating, so that one of the shops caught, and there was no little work in subduing the flames.

But Tom would not give up, and finally, after many trials, he hit on what he felt to be the right mixture.This he took out to the big lot, and having made a miniature tunnel with some of the sample rock, and having put some of the explosive in a hole bored in the big chunk Koku carried, Tom fired the charge.The result we have seen, It was a success.

A day after receiving Tom's message Mr.Titus came on and a demonstration was given of the powerful explosive.

"Tom, that's great!" cried the tunnel contractor."Our troubles are at an end now."But, had he known it, new ones were only just beginning.

Tom at once began preparations for making the explosive on a large scale, as much of it would be needed in the Andes tunnel.Then, having turned the manufacturing end of it over to his men, Tom began his preparations for going to Peru.

Mr.Damon was also getting ready, and it was arranged that he, with Tom and Mr.Titus, should take a vessel from San Francisco, crossing the continent by train.The supply of explosive would follow them by special freight.

"We might have gone by Panama except for the slide in the canal," Tom said."And I suppose I could take you across the continent in my airship, Mr.Titus, if you object to railroad travel.""No, thank you, Tom.If it's just the same to you, I'd rather stay on the ground," the contractor said."I'm more used to it."A day or so before the start for San Francisco was to be made, Tom, passing a store in Shopton, saw something in the window he thought Mary Nestor would like.It was a mahogany work-box, of unique design, beautifully decorated, and Tom purchased it.

"Shall I have it sent?" asked the clerk."No, thank you," Tom answered.

He knew the young lady who had waited on him, and, for reasons of his own, he did not want her to know that Mary was to get the box.

Carrying the present to his laboratory, Tom prepared to wrap it up suitably to send to Mary, with a note.Just, however, as he was looking for a box suitable to contain the gift, he received a summons to the telephone.Mr.Titus, in New York, wanted to speak to him.

"Here, Rad!" Tom called."Just box this up for me, like a good fellow, and then take it to Miss Nestor at this address; will you?" and Tom handed his man the addressed letter he had written to Mary."Be careful of it," Tom cautioned.

"Oh, I'll be careful, Massa Tom," was the reply."I'll shore be careful." And Eradicate was--all too careful.