The Air and Its Mysteries |
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Page 223
... sound along the surface ; hence on still , clear nights , sounds carry far . The fact that fogs are always ... sound - waves become so bent and broken that they only carry comparatively short distances . The combined effect of wind ...
... sound along the surface ; hence on still , clear nights , sounds carry far . The fact that fogs are always ... sound - waves become so bent and broken that they only carry comparatively short distances . The combined effect of wind ...
Page 225
... sound , since the sound enters one ear a fraction of a second before it enters the other . For direction- finding of sounds in air , two pairs of collecting - trumpets are used ; these are placed several feet apart , and thus the ...
... sound , since the sound enters one ear a fraction of a second before it enters the other . For direction- finding of sounds in air , two pairs of collecting - trumpets are used ; these are placed several feet apart , and thus the ...
Page 230
... sound are usually bent upwards , so that at a certain distance from the gun or other source of sound they pass overhead and are not heard , thus giving rise to a zone of silence . ( It is note- worthy that the only two places in the ...
... sound are usually bent upwards , so that at a certain distance from the gun or other source of sound they pass overhead and are not heard , thus giving rise to a zone of silence . ( It is note- worthy that the only two places in the ...
Contents
CLOUDLAND | 57 |
THE DROPS THAT WATER THE EARTH | 82 |
THE THUNDERSTORM | 109 |
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acoustic horizon aeroplane amount anemometer anticyclones appear atmo atmosphere aurora ball lightning balloon barograph barometer birds blow carbon dioxide caused centre cirrus climate clouds coast cold colour cumulo-nimbus cumulus cumulus clouds currents depression discharge dust earth electric Elmo's Fire fact fall feet fire flash flying forecasts gale ground heat height hemisphere horizon horse latitudes hour inches instance isobars James Glaisher known land layer light meteor Meteorological miles Miles Magister millibar moist moisture moon mountain night nitrogen northern hemisphere observations Observatory owing oxygen particles plants Plate polar pressure radiation rain rainfall rays reached record refraction regions result Royal Meteorological Society seen ship snow sometimes sound sound-waves South speed storm stratosphere summer surface temperature thunder thunderstorm tion tropical upper air visible warm water vapour waves weather westerly wind wings winter