The terms theory and model are defined, and students learn how a theory remains valid. Atomic Theory: The Development of the Atomic Theory: The terms theory and model are defined, and students learn ...

A scheme has recently been developed to present the general theories in lattice dynamics without specific assumptions about the atomic interactions. The present note aims at clarifying some basic ...

NMAH copy purchased with funds from the S. Dillon Ripley Endowment. This comprehensive scientific history presents for the first time a detailed and comprehensive study of the Bohr atom in all its ...

WE publish this week, as a special supplement, the substance of an address by Prof. N. Bohr on the development of the theory of atomic structure, and in particular of the latest form and tendencies of ...

Philosophy of Science, Vol. 26, No. 4 (Oct., 1959), pp. 295-309 (15 pages) A theory, analogous with the kinetic theory of heat, is described, in which the role of heat is shared by all the phenomena ...