. Journal of electricity . nothingbut extra large camp fires. It was essential to trainthe observers to recognize the character of the smokeof a small uncontrolled fire. It frequently happens that a haze covers por-tions of the National Forests during certain hoursof the day when lookouts at the elevations can giveno effective detection. The airplane observer, on theother hand, flying at higher altitudes can see throughthe moderate haze with sufficient accuracy to servethe purposes of quick detection. This is due entirelyto the difference of the angles of incidence of thesunlight from the poin
. Journal of electricity . nothingbut extra large camp fires. It was essential to trainthe observers to recognize the character of the smokeof a small uncontrolled fire. It frequently happens that a haze covers por-tions of the National Forests during certain hoursof the day when lookouts at the elevations can giveno effective detection. The airplane observer, on theother hand, flying at higher altitudes can see throughthe moderate haze with sufficient accuracy to servethe purposes of quick detection. This is due entirelyto the difference of the angles of incidence of thesunlight from the point of view of the airplane ob-server and the lookout. The same holds true forcertain conditions produced by the smoke mantlefrom a large fire. In these ways the airplane serves as a supple-mental detection agency, where primary lookouts areunable to function fully. It must be pointed out,however, that during the pre-fire season when only t *- Map of California -^ ^ showing national for ll- ests and air patrol w- routes m 1. The success of the forest air patrol has paved the way for the developmentof civil aviation. In the above map are shown the California forests andthe air patrol routes with the main bases and sub-bases. The forest patrolflew 409,965 miles this season and discovered 1,456 fires. a limited number of lookouts have been placed thesuppression agencies largely depend upon the air-plane for detection. As pointed out, stationary lookouts give twenty-four hours service. At best airplanes serve for ashort specific period during the course of their is for this reason that with the high hazardsexisting in California, dependence on airplanes fordetection, merely based on two daily trips over anygiven point, would not meet the by Airplane The airplane this year had ample opportunity todemonstrate its use in connection with definite mis- October 15, 1920] JOURNAL OF ELECTRICITY 367 sions in fire detection and fire suppression. After asevere li
Size: 1506px × 1659px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectricity, bookyear
