"Did you say, sir, that you hadn't any fog signal?"
"Ay, lad, them was my very words. You've been over pretty much the whole of this 'ere ledge, an' I reckon you didn't see anything that looked like one, eh?"
"No, sir; but when I came in here, before seeing the tower, I heard what I thought was a fog signal, and it has been going ever since."
"True for you, my lad, but what you heard, an' are hearin' now, is the whistlin' buoy, anchored off here a couple of miles to the east'ard, an' I reckon you're enough of a sailor to know what sich things are."
"I've heard them often; but never knew how the noise could be got out of a buoy which had no person to attend it."
"When you have the time there's nothin' to hinder your readin' what the Board says about whistlin' buoys; but I won't promise that you'll be any the wiser after doin' it, for in all these years I haven't been able to get it through my head, though I've figgered out a gen'ral idee of how she works. The top of the buoy is shaped a good deal like a pear, an' measures about twelve feet across the widest part. Inside the upper part, an' runnin' down into the sea to a depth of thirty-two feet, is an iron pipe thirty-three inches across it. Right at the very top of the pipe, an' showin' above the whole thing, is a 10-inch locomotive whistle, connected with some little tubes, which the inspector says make a piston-and cylinder movement, whatever that may be.
"Of course these 'ere buoys are anchored in deep water, an' it stands to reason that they rise an' fall on the waves, consequently the water inside the big pipe pumps up an' down, compressin' the air till it jest nat'rally has to escape through the whistle, makin' the noise. The whole thing was invented by a man named Courtenay, an' I'm bound to say he must have had a big head on his shoulders to think out sich a contrivance. It may be, lad, that you'll understand it better by readin' from the report; but I can't tackle the big words, an' don't know a piston or an apex from the Queen of Sheba, consequently it don't do me any great amount of good to puzzle over 'em.
"The Government has got eighty-eight whistling buoys in position, an' every blessed one of 'em cost nigh to eleven hundred dollars. Then there are one hundred an' thirty-nine bell-buoys which cost three hundred dollars apiece, an' five thousand one hundred an' eighty-three other buoys costin' different prices, so you see, lad, that outside the light-house part of the service, it takes a big pile of money to buy buoys an' keep 'em in position."
"An' that's only one little end of the expense," Uncle Zenas added in a tone of solemnity. "When you come to figger up the whole business it'll be easy to see how much responsibility we of Carys' Ledge carry on our shoulders, which reminds me that it's time you folks got up from the table an' let me have a chance to put the kitchen to rights."
"And I'll help you to do it!" Sidney cried gleefully, for it pleased him to have an opportunity of assisting those who had been so kind to him.