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Then off like the charge of a cannon he dashed, the loop of the collar flew out of the rivet, and the chain fell clanking on the paving-bricks. With grim satisfaction the dog set off in the track of the horse for Scargate Hall. And now he sat panting in the cottage of the gill, to tell his discovery and to crave for help.
If first-class paving-bricks weighing fifty pounds are soaked in water for twenty hours, they take up so little water that they will not weigh more than fifty-one or fifty-one and a half pounds when taken out. To find out how hard they are, the bricks are weighed and shaken about with foundry shot for a number of hours.
Those that were on the outside are not burned enough; those next it are not well baked, but can be used for the middle of thick walls. The next ones are of good quality; but those directly over the fires are so hard and brittle that they are of little use except for pavements. Paving-bricks, however, are not to be despised.
The wall-bricks, paving-bricks, and tiles, which were brought in baskets and hand-barrows, were loaves of bread and flat cakes.
They are not as smooth and well finished as pressed brick, but they are exceedingly useful. They need as much care in making as any others, and they must be burned in a much hotter fire to make them dense and hard. The tests for paving-bricks are quite different from those for ordinary building-brick.
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