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Water Borne Diseases:
Diseases like cholera and typhoid, as well as diarrhoea and dysentery, are spread through water. Germs of these diseases multiply in the gut of the infected person and come out in the faeces. Eggs of worms also come out in faeces.
If the infected faeces and urine are passed in an open field, as is unfortunately done in most of our villages, germs or eggs may be carried to the source of local water supply, such as ponds or'rivers. Bathing or washing of utensils in such water, or drinking it, can infect other people. Sornetinies in slum areas, the latrines are too close to handpumps and thus drinking water becomes a source of disease. It goes without saying that people who are obliged to live in such areas, or wh;have inherited a life style of using fields for toilet, are the ones . who suffer mob! from water borne sickness.
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A balance barometer This device depends on the fact that dry air is heavier than moist air at the similar temperature. Two equal cylinders (tin cans would do) are mounted, o
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