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The Molecular Tactics of a Crystal

Lord Kelvin

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Book Excerpt: 
. . .FNanchor_2_2" id="FNanchor_2_2">2. They are at present actually placed at distances consecutively each equal to the distance from joint to joint of the lattice frame.

Fig. 4.

§ 8. The roof of the model is hung by four cords, nearly vertical, of independently variable lengths, passing over hooks from fixed points above, and kept stretched by weights, each equal to one quarter of the weight of roof and pendants. You see now by altering the angles of the lattice work and placing it horizontal or in any inclined plane, as I am allowed to do readily by the manner in which it is hung, I have three independent variables, by varying which I can show you all varieties of homogeneous assemblages, in which three of the neighbours of every point are at equal distances from it. You see here, for example, we have the equilateral assemblage. I have adjusted the lattice roof to the proper angle, and its plane to the proper inclination to. . . Read More