AT the triennial conversazione of the Repton School Science Society on June 25 and 26, some forty demonstrations were shown. In the biology section, a way of recording the heart beat of a frog and the effect of stimulation by nerves, by electricity and by drugs, was shown and also a collection of local zoological and botanical specimens. Recent developments in chemical industry were illustrated by the moulding of bakelite cups in a home-made electrically-heated press producing a pressure of 1½ tons per sq. in., by the manufacture of rubber gloves from the latex by a simple dipping process using an experimental plant, and by electro-plating and bronzing on a semi-technical scale. A lecture was given in the physics section on electrical illumination, dealing with the development of lighting from the carbon filament lamp to the modern vapour discharge lamps. There were also demonstrations of a way of eliminating dazzle from motor-car headlights using the new polaroid screens and of a home-made model railway fitted with a system of automatic signalling and train control.
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