Discusses the use of patterns in science teaching, such as the theme of energy fields, to enable students to develop a greater understanding of the unity of science and a greater awareness of the interaction of science with other areas of knowledge. (JR)

Describes problems encountered in teaching of heat at secondary level as stemming from the fact that the word heat is used to imply two ideas: energy and interactions. Suggests some necessary measures for a teacher to avoid confusion in heat teaching. (CC)

Discusses some aspects in X-ray topography, including formation of dislocations, characteristics of stacking faults, x-ray contrast in defect inspection, Berg-Barrett technique, and Lang traversing crystal and Borrmann's methods. (CC)

Describes the principle involved in an osmotic pump used to extract fresh water from the oceans and in an osmotic power plant used to generate electricity. Although shown to be thermodynamically feasible, the osmotic principle is not likely to be used commerically for these purposes in the near future. (JR)

British Physics Centres are organizations within which university and school physics teachers meet to exchange ideas. Membership characteristics and activities of these centres are discussed. (JP)

A chronology of the development of time measurement is outlined. Measurement techniques are described and improvements in standards sequenced, persons who have contributed to the development of time measurement noted, as well as, various time measuring apparatus illustrated. (JP)

Discusses some important parameters of the boundary layer and effects of turbulence on the circulation and energy dissipation of the atmosphere. Indicates that boundary-layer research plays an important role in long-term forecasting and the study of air-pollution meteorology. (CC)

Presents two examples of astronomical problems suitable for use in teaching of Newton's and Kepler's laws of motion in a logical fashion. Indicates that the gratuitous presentation of physical principles may lead to removal of student interests and sense of achievement and satisfaction in the study of physics. (CC)

Discusses a four-step instructional presentation in which the twin on the earth is demonstrated older than the twin aboard a spaceship on the basis of the relativistic Doppler effect. Concludes that both twins can meet again at the same place in space at the expense of time. (CC)