OCR Text |
Show Method of Measuring Ozone. Before long it is likely that among other attractions of a seaside resort may be included announcements of the proportion of ozone in the air. Experiments have shown that it is possible to discover the amount of ozone in the air with fair accuracy. Slips of white blotting paper are soaked in a solution of iodide of potassium potas-sium and starch. These, protected from sunshine and rain, are exposed to the air for a definite period. According Accord-ing to the amount of ozone present so is tl ic paper colored in varying shades of yellow. If ozone is ::liunilant the paper will be of a very deep shade. |