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

E. Cobham Brewer

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.

343/512 (page 331)

Q. Whij is a EOOM (even without a fire') generally waemeb, than the open air ? A. Because the air in a room is not subject to much change, and soon becomes of the same temperatm-e as om* skin, after which it no longer feels cold. Q. How fast does wind travel ? A. A gentle breeze goes at about the rate of 5 miles an hour. A high wind from 20 to 60. A hurricane from 80 to 100 mdes an hour. Q. How is the yelocitt of winds ascer- tained ? A. By observing the velocity of the clouds ; and by an instrument contrived for the purpose, called an Anemometer. Pronounce An-e-moni'-e-ter. From two Greek words ave/nos (wind) and iierpov (a measure). This term is applied more fre- quently to an instnunent which measures the force of wind. Q. How is the velocity of the clouds ascertained A. By observing the speed of their shadow along the ground: which is found (in a high wind) to vary Irom 20 to 60 miles an hour. Q. JVhi/ is there always a strong deatjqht through the KEY-HOLE of a door ?