HOW TO MAKE A PAPER BAROMETER
Reading edition
Question.—J. K. writes: Can you tell me how a Barometer can be made with paper that tells what the weather is going to be?
Answer.—Paper barometers are made by impregnating white blotting paper in the following liquid, and then hanging up to dry:
Cobalt Chloride 1 oz.
Sodium Chloride ½ oz.
Acacia ¼ oz.
Calcium Chloride 75 gr.
Water 3 fl. oz.
The amount of moisture in the atmosphere is indicated by the following colors:
Rose Red Rain
Pale Red Very Moist
Bluish Red Moist
Lavender Blue Nearly Dry
Blue Very Dry