. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. exposed on a recent (1921J airship flight over the Atlantic ocean and along the eastern coast of the United States is shown en plate 6. and a record of such flight in an Army dirigible is shown by Fig. 5. It will be noticed also from plate 6 that the hythergraph was exposed in the air-stream well forward just beneath the speed indicator. HEAVIER-THAN-AIR INSTRUMENTAL BEHAVIOR In heavier-than-air craft, such as airplanes and seaplanes, the hythergraph is useful in giving the same definite warni
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. exposed on a recent (1921J airship flight over the Atlantic ocean and along the eastern coast of the United States is shown en plate 6. and a record of such flight in an Army dirigible is shown by Fig. 5. It will be noticed also from plate 6 that the hythergraph was exposed in the air-stream well forward just beneath the speed indicator. HEAVIER-THAN-AIR INSTRUMENTAL BEHAVIOR In heavier-than-air craft, such as airplanes and seaplanes, the hythergraph is useful in giving the same definite warning—through the medium of the humidity trace—of the approach of thick weather. The temperature trace shows changes of temperature incident to eleva- tion (see Fig. 4) and, also directly, the character of the ground as to whether it reflects or absorbs the sunlight during the flight. Fig. 4 shows that unlike the changes in temperature and humidity which occur on the surface of the earth, the humidity decreases with the temperature. This is owing to the fact that the relative humidity as well as the temperature is normally lower in increased altitude. On the surface of the earth, especially is this marked in California (see Fig. 7) the humidity decreases as the temperature increases. Tests conducted during the past four years, have demonstrated the practical value of the hythergraph in general aeronautics. In such work it is important to differentiate between experimental and routine records. Both are essential to aircraft operation for the newness of the science makes it imperative that complete automatic records be available whenever PLATE NO. 7. U. S. ARMY AIRSHIP C-2, CARRYING HYTHERGRAPH This historic airship has the interesting record of liaving flown from New York to Newfoundland and return, and also from the Atlantic to the Pacific Coast. This photograph was made while the ship was on a cruise over Hainpton Roads, Virginia: during this flight the hythergraph
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