http://www.longshorthair.com/hair-hygrometers-2/
Hair hygrometer !!???
What country are the people whose hair is best suited to make a hair hygrometer? Why why people in this country that best suits for this? EASY 10 POINTS!
To make a hygrometer hair needs a fine hair, long and straight. A Blond hair is thinner than the black hair. The cross section of hair should be round. The cross section of black (black) hair is elliptical. The thick black hair European ordinary (which is round cross section) is about 40 microns. The thickness of the hair taken from a blonde girl is about 10-15 microns. (A millimeter is 1000 microns!). Blond hair to make a hygrometer must also be long and straight. Minor women and girls (blonde) from Germany, Holland, Russia and Scandinavia provide quality good to make hair hygrometers. If you want to make a hygrometer, please use ether to clean the oily substances in hair. The ether is a chemical very good to absorb fats and oils. Put the clean () the hair around a reel (a) 20 mm in diameter, attach a weight of 5-10 grams at the end one of the hair; connect the other end of the hair to a fixed point; Place a needle on the reel as a pointer; Voila!. Now you have a hygrometer! (Obviously the reel must have a shaft) When the relative humidity changes, the pointer will move. (As humidity increases, the hair becomes longer and turns in the coil). If you cut thick paper a round and paste it into an appropriate place, may mark the movement of the pointer (needle) and relative humidity values.
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Dial Hygrometer / Thermometer $34.75 The dial hygrometer / thermometer is ideal for classroom, lab or industrial use. Large, clear, 20 ~ 100% RH scale on 4″ dial. Easily read from a distance. Use a precise synthetic hair hygrometer with an accuracy of ±5%. Plastic face meets food industry requirements. Inner dial shows temperature using a bimetal thermometer, with an accuracy of ±2°F. Wall mounts. Weight 3.7 oz…. |
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New All-In-One Cordless Hair Beard Trimmer Washable Easy Cleaning Ergonomic Silver by Panasonic $41.99 Beard trimmer. High performance stainless steel blade. Corded/cordless operation. Great for beards of any length. No extra combs required. Silver…. |
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Hands-On Earth Science Activities For Grades K-6 (J-B Ed: Hands On) $18.52 Hands-On Earth Science Activities is an excellent resource for educators interested in motivating their students to become more involved in the science process. It provides over 165 inquiry-based activities and it incorporates key concepts related to basic earth science. This is the perfect resource to help your students cultivate their thinking and reasoning skills in a fun and innovative way. Th… |
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Relative humidities and vapor pressures over the United States, including a discussion of data from recording hair hygrometers / by Preston C. Day … / U.S. Dept. of Agriculture. Weather Bureau) … |
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INSTRUCTIONS FOR INSTALLATION, OPERATION AND MAINTENANCE OF THE COMPLETE FRIEZ RAYSONDE DIAMOND-HINMAN SYSTEM INCLUDING BOTH HAIR ELEMENT AND ELECTRIC HYGROMETER TYPES … |