OCR Text |
Show Paper Barometer Henley's Twentieth Century Book of Recipes publishes the following method of making a paper barometer: Saturate white blotting paper with the following liquid and then hang up to dry : Cobalt chloride, 1 ounce; sodium chloride, ounce; calcium chloride, 75 grains; acacia, '4 ounce; water 3 ounces. The amount of moisture In the air Is roughly Indicated by the changing color of the paper, rose red indicating rain; pale red. very moist; bluish red, moist; lavender blue, nearly dry; blue, very dry. |