"It isn't just what I want," Tom decided, after he had put small quantities in little steel bombs, and exploded them, at a safe distance, and under a bank of earth, by means of an electric primer.
"Why, Tom, that powder certainly burst the bombs all to pieces," said Ned, picking up a shattered piece of steel.
"I know, but it isn't powerful enough for me. I'm going to send for samples of another kind, and if I can't get what I want I'll make my own powder. But come on now, this stuff gives me a headache. Let's take a little flight in the Humming Bird. We'll go see Mr. Damon," and soon the two lads were in the speedy little monoplane, skimming along like the birds. The fresh air soon blew away their headaches, caused by the fumes from the nitro-glycerine, which was the basis of the powder. Dynamite will often produce a headache in those who work with it.
Two days later Tom and Ned set off for Sandy Hook.
This long, neck-like strip of land on the New Jersey coast is, as most of you know, one of the principal defenses of our country.
Foreign vessels that steam into New York harbor first have to pass the line of terrible guns that, back of the earth and concrete defenses,
