|Chapter 1||The Earth|
2. For example, when you study the shape of any stone or, as well, of any regularly or irregularly shaped clump, you will soon find that its center of gravity is not located equally in all parts of it. In particular, you may learn this most easily from a bulky wooden stake if you put it on the water and it will always dip its center of gravity deepest into the water. Thus this is the second point which everybody can easily find in every object.
3. The third point with regard to a body is its true center. It should, however, never be confused with the body’s center of gravity. Thus every body has two center points, one of gravity and another one of its physical measurements. You may also examine all kinds of bodies in this way, and you will never find that the center of gravity will completely coincide with the center of physical measurements. This would not even happen in the instance of a perfect, mathematically properly founded metal ball, and this is because no body ever consists of so perfectly even parts that the point of gravity would coincide precisely with the actual center of its physical measurements.
4. For example, if you take pure steel as the most solid of all metal substances and you break such a steel bar into two pieces, you will easily notice the crystalline texture at the white crack, which will indeed appear to be strikingly uniform to the unaided eye. But if this fractured plane were to be studied under a microscope, it would take on an appearance as though somebody were looking down from a high mountain to all kinds of big and small ridges. But if such a difference can be noticed in the crystalline structure of one of the most solid of metal substances, how much bigger will such a difference even be in a far less dense body whose crystalline structure of big and small, dense and less dense, is often easily perceivable even to the unaided eye. According to this, the principle established above can be verified even more that the center of gravity and the center of physical measurements can never coincide in a single point.
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