An algebraic definition of time differentiation is presented and used to relate independent measurements of position and velocity. With this, students can grasp certain essential physical, geometric, and algebraic properties of motion and differentiation before undertaking the study of limits. (Author)

A global satellite navigation system based on the use of time in measurements of speed, distance, and location is described and explained. (DT)

The roles of physics and of technology in progress are discussed generally; the role of education in the improvement of the general public's understanding of science is emphasized. (DT)

The author describes a 1934 visit to the Berkeley radiation laboratory. The state of physics at that time and the life of persons doing basic physics research in radiation are discussed. (JP)

Data for the raw frequency of use of 138 physics journals in the science library at MIT are re-examined and converted to densities of use-per-metre of shelf. There is no evidence for synchronous obsolescence in the 1955 to 1968 volumes, and some evidence of greater density of use with greater age. (Author/LS)

Describes the Surplus Buying Agency, a British organization from which schools can obtain physics materials and equipment obtained from governmental and industrial sources. (MLH)

Inheritance of the Atomic Energy Commission's Draft Environmental Impact Statement for the Liquid Metal Fast Breeder Reactor Program by the Energy Research and Development Administration has caused much concern among members of the Scientists' Institute for Public Information (SIPI). SIPI members are concerned about the inadequacy and economic…

Discussed is the environmental impact of the Liquid Metal Fast Breeder Reactor (LMFBR). Possible problems associated with the LMFBR are defined and the method of research being following is deplored. (MA)

Traces the development of quantum theory from the concept of the discrete stationary states, to the generalized concept of state, to the search for the elementary particle. States that the concept of the elementary particle should be replaced by the concept of a fundamental symmetry. (MLH)

This textbook presents basic science to children during two or three consecutive years with an increasing number of facts and a progressive elevation of ideas. Special knowledge of things and the general development of the mind are attained by this method of repetition, but avoids monotony. The author has tried to keep clear of this danger by…