4H4 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



metal, glass, etc., and they can be arranged either obliquely or perpen- 

 dicularly to the direction of the stage motion. 



Fig. 124. 



Vogel-Wanach Large Measuring Microscope (Model II.).* — This 

 apparatus (fig. 125), 9a in the maker's catalogue, is specially constructed 

 for the measurement of star spectra. It is mounted on a strong tripod 

 with a hinged pillar, so that any desired inclination between 0° and 90° 

 can be arranged. Microscope and measuring stage are arranged on a 

 specially stiffened carrier, and an inclosed glass plate forms the object- 

 bearer. A circular mirror with universal movement is set below the 

 stage and illuminates the object. The measuring screw has an available 



* Otto Toepfer und Sohu's Catalogue (Neue Astrophysikalische Apparate, 

 1908), Potsdam. 



