A'] 



sions of the 

 of the stage- 

 of objects, by 

 a very ingeu 

 trived by Mr. 



culty. It CO 4 \^ 



in which th( 

 from side to 

 nicated by i 

 against one e 

 the other by ; 

 power w ith v 

 piece micror 

 adjustment i; 

 Other mici 

 meter,' are : 

 pensive and 

 them over. 



Some aut 



of objects by 



to the figure 



consisting of 



of knowTi V8 



power as the 



times the div 



These meth« 



cavise the sizi 



tained withe 



and calculati 



the size bein 



Whenever 



magnifying ] 



shouhi alwaj 



the figures. 



omit all noti 



ther an obje 



or as small a 



selves and  



find for him 



cultv in ide] 



natm-al histc 



of objects ^ 



under which 



state the ms 



substance oi 



and inconve 



Measures. 



dimensions  



consist of pj 



of a line. 



millimetre, 



of a Rheni 



When fracti 



this is usual 



to the figure 



limetre and 



Germany frj 



but whethei 



