rence to forces of pressure and oscillation, to be sustained or guarded against; and, therefore, in every case, with especial consideration of the strength of our materials, and the nature of that strength, elastic, tenacious, brittle, and the like.
Now although this group of arts nearly always involves the putting of two or more separate pieces together, we must not define it by that accident. The blade of an oar is not less formed with reference to external force than if it were made of many pieces; and the frame of a boat, whether hollowed out of a tree-trunk, or constructed of planks nailed together, is essentially the same piece of art; to be judged by its buoyancy and capacity of progression. Still, from the most wonderful piece of all architecture, the human skeleton, to this simple one, the plowshare, on which it depends for its subsistence, the putting of two or more pieces together is curiously necessary to the perfectness of every fine instrument; and the peculiar mechanical work
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