AIR AND AVIATION.
In the current ..''Science. Progress,'.' Dr Shaw liafe some interesting remarks on the structure. of the; atmosphere. Air-craft may be navigated Up to 10,'OOGfit, and at the higher levels the conditions'of ,'-tiie air change' materi? ■ally. . There is not go much fluctuaition as there is near.the earth's surface, but the. winds may -reach a -speed of JOO miles an hour." Clouds 1 : furnish evidence of ascending and descending currents forming in the first 'and evaporating in the .second. Inequalities of land surface produce cliff ' eddies of a ; remarbaibfe.kind;. so that facing a gale, of'-wind you can throw your halt'down-the. cliff and'it will come (back to you', or at least it ought 'to, according _to the. theory' of the eddy. Dr Shaw fails' to offer any hope that .the airship will he safe in a squall'.' When" it sees one coming it must run away. This it can do if at can travel at right angles to the approaching .squall with a velocity half as great again as rthat of the normal component of the surface, wind. Gaisitiness is itb the flyer what a bumpy sea is to a small boat. Dr Shaw calculates that twenty miles per hour is /the. limit of safety in' ordinary gustiness.
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Wairarapa Age, Volume XXXII, Issue 10609, 16 April 1912, Page 4
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209AIR AND AVIATION. Wairarapa Age, Volume XXXII, Issue 10609, 16 April 1912, Page 4
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