10 



Introduction. 



The number of persons employed in the manufacture of scientific instruments 

 s considerable, as the following table schows: 



Description of goods. 



Number of 

 establishments. 



Number of 



persons 

 employed. 



Mathematical, physical and chemical in- 

 struments 190 3136 



Optical instruments 150 2408 



Drawing instruments 52 613 



Fine balances 47 443 



Thermometers and barometers . . . '. . 87 1014 



Here only those establishments are considered which employ more than 

 10 persons. The number of those employing less than 10 persons may be 

 roughly estimated at three times the above numbers. 



The collective exhibition, Group 21, forms an elegant picture of the 

 German scientific instrument industry, it does not, however, represent its entire 

 extension. Visitors requiring information on instruments and their makers 

 not found represented in the Exhibition are requested to address the Committee 

 of the ^Deutsche Gesellschaft fiir Mechanik und Optik" in Berlin or 

 the Editor of the w Zeitschrift fiir Instrumentenkunde" in Berlin W. 



Dr. A. Westphal. 



