Franz Schmidt & Haensch, Berlin S. 



71 



II. Spectrum Apparatus with rectilinear path of rays. 



The adjustments are made in the manner specified under I. Beside 

 the well-known small Browning pocket spectroscope the following types 

 .are made: 



a) Browning's Pocket Spectroscope with 3 prisms, movable 

 slit and reflecting prism for examining two spectra. (Fig. 5 a.) 



b) Spectrum Apparatus according to H. W. Vogel with 

 universal stand. (Fig. 5a, b, c.) The apparatus is fitted in elegant case 

 with all its accessories, such as bottles, bottle holders, mirror, burners etc. 

 and dissectable stand. Eespecting its applicability to many purposes we 



Fig. 5b. 



Fig. 5c. 



refer to the , y Berichte der Deutscli. Chem. Gesellschaft, 1875 and 1876". 

 - If required these instruments are also fitted with scale . 



c) Hoffmann's Spectrum Apparatus. This is made in various 

 sizes, also in pocket form. The apparatus shown in the German Edu- 

 cational Exhibition is fitted with scale and comparison prism. The 

 Jan sen body consists of two parts whose relative position is adjustable. 

 The Fraunhofer lines remain in all positions at minimum deviation. 



