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SUMMARY OF CURRENT RESEARCHES RELATING TO 



and-pinion, by means of which the coarse adjustment is regulated. |] The 

 position of the vertical illuminator, once fixed, need never be disturbed. 

 The motion due to the fine adjustment may be neglected. 



The above motion of the stage, moreover, greatly increases the 

 working distance of the stand ; this is very important, as it permits the 

 examination of very thick pieces of metal. 



By means of the special holder it is possible to place immediately on 

 the stage, in the proper position to be oxamined, any sample of metal, 

 no matter how irregular its shape, thus doing away with all tedious 

 mounting of irregular specimens, or with the cutting of two parallel 

 surfaces. 



