 | U.S. Coast and Geodetic Survey - 1916 - 318 Seiten
...as its height would permit it to be seen over 20 miles if of sufficient power. FOG SIGNALS.—Sound is conveyed in a very capricious way through the atmosphere....directions and at different distances from the origin of the sound signal, even in clear weather. Therefore too much confidence should not be felt as to hearing... | |
 | United States. Hydrographic Office - 1916 - 608 Seiten
...— Sound is conveyed in a very capricious way through the atmosphere. Apart from the influence of the wind large areas of silence have been found in...directions and at different distances from the origin of sound, even in clear weather; therefore, too much confidence should not be felt as to hearing a fog... | |
 | United States. Hydrographic Office - 1916 - 516 Seiten
...of little brilliancy, as its height would permit it to be seen over 20 miles if of sufficient power. Fog signals. — Sound is conveyed in a very capricious way through the atmosphere. Apart from the influence of the wind large areas of silence have been found in different directions and at different... | |
 | United States. Hydrographic Office - 1916 - 594 Seiten
...of little brilliancy, as its height would permit it to be seen over 20 miles if of sufficient power. •Fog signals. — Sound is conveyed in a very capricious way through the atmosphere. Apart from the influence of the wind large areas of silence have been found in different directions and at different... | |
 | United States. Hydrographic Office - 1916 - 538 Seiten
...of little brilliancy, as its height would permit it to be seen over 20 miles if of sufficient power. Fog signals. — Sound is conveyed in a very capricious way through the atmosphere. Apart from the influence of the wind large areas of silence have been found in different directions and at different... | |
 | United States. Hydrographic Office - 1916 - 592 Seiten
...of little brilliancy, as its height would permit it to be seen over 20 miles if of sufficient power. Fog signals. — Sound is conveyed in a very capricious way through the atmosphere. Apart from the influence of the wind large areas of silence have been found in different directions and at different... | |
 | United States. Hydrographic Office - 1916 - 576 Seiten
...of little brilliancy, as its height would permit it to be seen over 20 miles if of sufficient power. Fog signals. — Sound is conveyed in a very capricious way through the atmosphere. Apart from the influence of the wind large areas of silence have been found in different directions and at different... | |
 | United States. Hydrographic Office - 1917 - 670 Seiten
...of little brilliancy, as its height would permit it to be seen over 20 miles if of sufficient power. Fog signals. — Sound is conveyed in a very capricious way through the atmosphere. Apart from the influence of the wind large areas of silence have been found in different directions and at different... | |
 | United States. Hydrographic Office - 1917 - 606 Seiten
...of little brilliancy, as its height would permit it to be seen over 20 miles if of sufficient power. Fog signals. — Sound is conveyed in a very capricious way through the atmosphere. Apart from the influence of the wind large areas of silence have been found in different directions and at different... | |
 | Squire Thornton Stratford Lecky - 1918 - 966 Seiten
...accurate casts were obtained with Lord Kelvin's invaluable sounding-machine. It is important to know that sound is conveyed in a very capricious way through the atmosphere. Apart from wind or Atmoiph»ric visible obstructions, large areas of silence have been found in obstruction of... | |
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... even in clear weather. Therefore too much confidence should not be felt as to hearing a fog signal. 
