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SUMMARY OF CURRENT RESEARCHES RELATING TO 



is attached to a movable ring so that the rotation is on the base and 

 not on the stage (as in the larger Nachet models), the mirror remaining 

 fixed. 



Fig. 6. 



The special object of the design is stated to hare been to reduce 

 the height of the instrument as much as possible, the method adopted 

 for the rotation " allowing the stage to be less elevated above the 

 table and thinner." 



Nachet's Portable Microscope. — This Microscope is shown in 

 Figs. 7 and 8 set up for use as a table Microscope. Fig. 8 is intended 

 to show its application to the observation and dissection of large 

 surfaces or objects contained in small troughs or tubs. By loosening 

 the milled ring just above the stage (A, Fig. 8, C, Fig. 9) the com- 

 pound body can be removed, and an arm L carrying a lens or 

 doublet substituted. To put the instrument in its box (Fig. 11), the 

 stage P (Fig. 10) is turned completely over on the pivot 0, and the 

 base is then only 4*5 cm. in height. The box is 19 cm. x 11 cm. x 

 6 cm. 



The instrument seems to be an excellent solution of the problem 

 of constructing a Microscope which shall be really " portable " and 

 at the same time quite steady for ordinary use. 



