A. Kriiss, Hamburg. 43 



their objectives, both tubes being thus directed to the axis of the instrument. 

 By means of the rod s the telescope may be connected with the mechanism 



Fig. 2. 



behind any of the prisms and thus any number of the latter may be put into 

 action. The apparatus admits, therefore, of working with different dispersive 

 powers.- 



Universal Spectroscope of Original Construction, for Spec- 

 trum Photometry, Qualitative and Quantitative Analysis. (Fig. 3.) 



This universal spectroscope is most suitable for physical and chemical 

 laboratories and can be applied for all purposes of physiological chemistry. 

 For qualitative analysis it is fitted with scale tube and simple micrometer slit. 

 With divided drum, platinum lips, comparison prism- and lamp for illumination 

 of scale. For quantitative analysis and photometry of the absorption spectra it 

 is fitted with a micrometer double slit with two divided drums (one of these 

 with vernier) and Yierordt's symmetrical ocular slit, absorption vessel with 

 parallel sides and Schulz's glass body, stand with micrometer adjustment for 

 the latter and lamp for observation. 



The Universal Spectroscope is fitted with a flint glass prism of 60 and 

 a triple Rutherford prism; these being interchangeable the apparatus may be 

 worked with low or high dispersion. 



