A guide to the scientific knowledge of things familiar / by the Rev. Dr. Brewer.

  • E. Cobham Brewer
Date:
[1858]
Catalogue details

Licence: Public Domain Mark

Credit: A guide to the scientific knowledge of things familiar / by the Rev. Dr. Brewer. Source: Wellcome Collection.

    17/512 (page 5)
    Sndly—The chemical changes which take place in the earth's surface, and in the air; and 3rdly—Probably friction between cur- rents of air of unequal temperature, passing by each other. Q. JIow HIGH are the LiaHTNiira clouds from the earth ? A. Sometimes they are elevated 4 or 5 miles; and sometimes actually touch the earth with one of their edges: But they are rarely discharged in a thunder storm, when more than 700 yards above the surface of the earth. Q. Sow do such ohjecfs as trees, steeples, animals, Sfc., help the discharge of electric clouds ? A. They reduce the distance between the electric cloud and the earth. Q. Why is lightning sometimes foeked ? A. Because the flash is divided by certain terrestrial objects which it ap- proaches. Q. Why is the flash sometimes zig-zag-? A. Because hghtning condenses the 8 3