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.
5. Anyone can very easily comprehend this principle when manufacturing a scale. If one were to manufacture a mathematically perfect, symmetrical scale beam out of metal, as even as possible in density, and he would then balance it in a scale fork, he would find out that, even with such mathematically correct perfect proportions, the two scale beams, or rather the two parts of the same scale beam, will never form a perfect horizontal plane. But one part will be a little bit out of balance from the other, and the manufacturer of the scale will have to modify the scale beam on one side or the other with a file or hammer. The reason for this lies of course in the principle mentioned above.