I VENTURE to call attention to a simple and effective way of demonstrating the linear expansion of solids when heated, first suggested, I believe, by M. Kapoustine (Journal de Physique, December 1883, ...

A bullet-speed experiment reveals that the Earth's inner core may be softer and more dynamic than previously thought.

MR. MADAN's description of a device for showing that metals and solids expand when exposed to heat is very interesting, especially as such an arrangement, but with important modifications, is capable ...