Show paper barometer henleys Hen leys twentieth century book of recipes publishes the following method of making 0 paper barometer saturate white blotting paper with the following liquid and then hang up to dry cobalt chloride I 1 ounce sodium chloride ounce calcium chloride 75 5 grains acacia V 1 ounce water 3 8 ounces the amount of moisture in the air Is roughly indicated by the changing chang ing color of the paper rose red indicating ruin pole red very moist bluish rel red moist lavender blue nearly dry blue very dry |