Abstract
LONDON. Physical Society, April 27.—Will C. Baker: Experiments with mercury jets and the phenomena exhibited at their impact with steel and glass. As a light sphere is retained in a vertical jet of fluid in virtue of the change of momentum of the fluid produced by its adhesion to the sphere, it was thought that a steel sphere would not be retained in a vertical mercury jet, as there is no ‘wetting’ of the steel by that fluid. Experiment showed that a given bicycle ball might or might not be retained by such a jet, as the speed of the jet (at a given angle of incidence) rose above or fell below a critical value for that ball. Conditions were simplified by the use of cylindrical and of plane surfaces of steel, and an approximately constant time of adhesion between mercury and steel was found for various speeds of impact. This led to the explanation of the phenomenon in terms of the well-known instability of jets.—E. P. Perman and W. D. Urry: The elastic constants of glass. The coefficients of compressibility of soda-glass and Jena 16m glass have been determined at six temperatures ranging from 30° C. to 80° C. From experiments on the effect of external pressure only, Poisson's ratio has been determined, and hence the modulus of rigidity and Young's modulus.—G. Eric Bell: A valve-maintained high-frequency induction furnace and some notes on the performance of induction furnaces. In Part 1 the electrical design is given of a valve-operated high-frequency induction furnace; in Part 2 a theory of the behaviour of induction furnaces in general is developed.
Article PDF
Rights and permissions
About this article
Cite this article
Societies and Academies. Nature 121, 814–815 (1928). https://doi.org/10.1038/121814a0
Issue Date:
DOI: https://doi.org/10.1038/121814a0