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

  • Brewer, Ebenezer Cobham, 1810-1897.
Date:
[1863]
Catalogue details

Licence: Public Domain Mark

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

    18/512 (page 6)
    air in the immediate advance of its path, and flies from side to side, in order to pass where there is the least resistance. Q. When is theJlasJi steai'JHT ? • A. When the distance through which i:he flash has to pass is sinall, so that the air in advance of its path is not sufficiently condensed, to cause it to fly from side to side. Q. What is SHEET LIGHTKING ? A. The hght of a flash reflected in the clouds, when the flash itself is concealed from view. Q. WTiaf OTHEE form does lightning occa- sionally assume ? A. It sometimes assumes the globular form, and sometimes what is caUed the brush form. This br'.ish discharge is what is called Castor and Pollux, or Elmos-fire. Dr. Faraday says, it is a discharge between the air and some conductor. The cause of globular lightning is not kno-wn. Q. Wk}/ does lightning produce a Jlash when it passes through the aik?