SPECIAL USE OF MICROSCOPE UPRIGHT 



403 



tinuous observations on the development of the minutei forms of 

 life. 



In such cases the table is quite unsuitable, and special stands 

 have to be employed that from their form give great stability to the 

 microscope, and afford the body and head of the observer as much 

 command and ease in using the instrument in this awkward position 

 as can be obtained. 



This is best done by means of a firmly made tripod, with a V- 

 shapecl piece at the top made to receive the feet of the microscope. 

 Fig. 339 is an outline of the construction. The three legs of the 



FIG. 340. Using the microscope in an upright position for special investigations 

 necessitating its use in this position. 



tripod are well made and firmly braced together with metal rods. 

 A, A is the bed for the tripod feet of Powell and Lealand's large 

 stand. B is a table which slides to the level of A, A, or down to its 

 present position. This is mainly to receive the lamp. 



By this arrangement the body can so place itself as to command 

 the instrument fully, and there is an arrangement at the two sides, 

 A, A, to receive supports on which the arms may rest when any 

 other manipulation than that involved in working the fine adjust- 

 ment and the milled heads of the stage is required. The manner of 



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