Democratic Sentinel, Volume 13, Number 44, Rensselaer, Jasper County, 22 November 1889 — What Is Fog? [ARTICLE]

What Is Fog?

In an inter eating letter to Science, H. A. . Harlen, of Washington, gives some interesting and valuable wartictdars respecting the properties nature of fog. He says that it xiitted that fog is simply cloud composed of water dust or solid minute spheres of water from 1-7,000 to 14,900 of an inch in diameter. Many have supposed that a duet particle must be a nucleus for each sphere, but an examination under the microscope of evaporated fog has proved that such is not .the case. . Briefly stated, the cause fog Is as follows: It is essential that there be no wind. The sky ■nust be clear. The air must be saturated or hearly so. The formation ol fog is purely a mechanical process, ■inaccbmpanied with heat.