Show MAPPING WINDS for the AIRMEN I HE aviator is greatly dependent upon the THE T I windi If he does not like Jike the wind at one I level vel it is his privilege and his duty to seek another level at which the prevailing air currents are more favorable to his voyage But this assumes assumes assumes as as- as- as that the pilot knows where to seek such a favoring wind and this is not always in accord with the facts The United States weather bureau is greatly interested in the meteorological problems that confront the aviator for it sees here an opportunity opportunity opportunity to get its findings into immediate practical application in a way which the still uncertain ground weather eather predictions ions cannot yet hope to toI I The eA Aviators viator's Weather ther Map Shows r All the Conditions s of the Atmosphere 1 Through rough Which His n Course Coarse Lies w r i. i t. t h conditions above e the earth The clement element of altitude altitude alti alti- tude has always its significance but hut never such sucha a paramount one as in this connection One of or the new net aids to aviation described in the Scientific American is a aind wind ind map which shows how fast and from what quarter the wind is blowing at various altitudes This of or course is not an instrument of observation it is simply an ingenious little scheme for recording in most convenient form the results of observation and inference But as an ingenious scheme it surely takes take front rank The wind is represented by arrows The di direction direction di- di of or the arrow indicates of course the I r N I II Ir r I I r r un LA nas accordingly paid a n great deal of attention to investigating wind conditions conditions con con- aloft It will be recalled for instance that during the period preceding g the transatlantic flights one of the bureaus bureau's men was constantly at hand handin in Newfoundland to advise the aviators as to weather conditions over the ocean while there was likewise published by the weather man a comprehensive discussion of alt all the meteorological considerations involved in transatlantic flying Considerable new equipment is called for in the effort to take good acco account nt of the atmospheric tion of the wind its its length is proportional to the velocity The height is indicated by the concentric circles which form the background of the diagram diagram dia dia- diagram gram the quarter in which the observation is 3 made is shown by the position of the arrow on the thc circumference rence of its circle and a convenient means of reading of this feature of the map is afforded afforded af at forded by printing in a few of the radii What appear to be crossed arrows are merely overlapping arrows where winds of substantially the same direction but varying velocity have been found at different times in the same point |