I'SEFUL TO THE MICROSCOPIST 



1133 



Multiples of any of the above may be obtained in the same manner as 

 in the preceding example. 



Thus, if the diameter of the circle = T f ^ inch, then the square of 3 being 

 1) and -7854 x 9 = 7-0686 sq. ^ inch and -05067 x 9 = -45603 sq. millimetre, 

 is the area required. 



Volumes of Spheres 



16-75835 cubic millimetres. 

 8-58024 



in. diameter 



= 1-02266 cubic T V inch = 

 = -52360 



A 



" 

 TTJTfTf )) 



1 mm. diam. 

 100 n 

 10 u 



4-96543 

 00858 



30301 ., 

 52360 .. 

 52360 



52360 cubic mm. = 31-952 cubic 

 = 523600-0 n =31-952 



523-60 -03195., 



52360 = -0000310:, 



inch. 



^Multiples of any of the above follow the preceding example of cubic 

 measures. Thus, if the diameter of the sphere = 30 /i, then the cube of 

 hoing 27 and 523-6 > 27 = 14137'2 cubic p. and '03195 x 27 = '86265 cubic T5 V?T 

 inch, is the volume required. 



