12 



CLINICAL BACTERIOLOGY AND 



namely, to obtain so many revolutions per minute, varying 

 from 2,500 to 5,000. It is devised for the separation of 

 the solid and liquid elements, blood, pus, milk, urine, and 

 other fluids, for examination purposes. 



Fig. 6. — Hand-driven Centrifuge. 



The haematocrite attachment and tube-holders for pur- 

 poses of combined lightness and strength are made of 

 aluminium. 



A hand centrifuge is conveniently fitted to the table 

 (which must be firm and rigid) by means of a double- 

 tongued clip. 



Where one can obtain a sufficient pressure, a water- 



