12 



Otto Bohne, Berlin S. 



its movements continuously, noting, at the same time, day and hour. 

 These graphical records traced up.on a prepared strip of paper form 

 interesting material for future comparisons. 



Fig. 1. 



The new registering instruments, - - such as the barograph and 

 thermograph, which automatically record the position of the barometer 

 and thermometer with a degree of regularity and precision unattainable 

 by the most careful observer, render metereological observations very 

 little troublesome and thus also interesting to the lay public. The 

 low prices and simple manipulation of these instruments conduce to 

 increase their popularity and encourage the useful and interesting study 

 of weather prognostication. 



Fig. 2 represents in Y 4 full size 

 of demonstration. 



barometer for purposes 



