RAILWAY W.E.A. CLASS

Evening Star, Issue 23352, 23 August 1939, Page 7

RAILWAY W.E.A. CLASS

The meeting of the above was held in the Hillside Social Hall, when there was a good attendance of members and visitors. The subject of the meeting was a lecture by Professor 11. Jack, ‘ Physics in Industry and Daily Life.’ The lecture was illustrated by electrical and mechanical demonstrations, and also by project illustrations. The speaker said that Newton’s law of gravity was explained as the cause of the film on top of a liquid. Sir Ronald Ross discovered that the malaria mosquitoes’ larvae supported' themselves on this film, and ho found that a small quantity of kerosene would spread over a pond or stagnant water and destroy the larvae, so that the problem that threatened to stop the building of the Panama Canal, malaria fever, was solved bv spraying all the ponds and stagnant" water with kerosene. One of the experiments was a demonstration of the methods used in coloured photography, and also in mixing paints, by combining two or more of the primary colours —violet, red, and green—to make any required colour or shade. The astonishing effects that could be produced by using ultra-violet ray lighting in home lighting was shown, and created great interest. At the conclusion of the lecture a vote of thanks was accorded Professor Jack and his assistant.