THE BAROMETER AND THE WEATHER. 



195 



WEATHER CHART, OCTOBER 6, 1875. 



feathers ^ ; 3d. Afresh to strong breeze, by an arrow with two barbs and no 



feathers ^ ; 4th. A gals, by an arrow with two feathers > > ; and 5th. A 



violent gale, by an arrow with four feathers >. The temperature in the 

 shade is marked in figures with a sranll circle to the right, indicating degrees as 

 60-. These figures ^tand in the places where the observations are made. The 

 other figures usually \vi*h decimals, and placed at the end of the dotted lines 

 give the height of the barometer the doited line showing where this particular 

 height remained the same at the time of observation. Theee dotted lines are call- 

 ed isobars, ' or equal weights the weight or over-head pressure of the atmosphere 

 being the same all along the line. 



