Xo. 54 126. 



Spectroscopes and Stands. 



511 



54 123 C, 54126. 1:4. 



54 123 A. 1: 1. 



54.119. Pocket Spectroscope after Hofmann, Figure 



The spectroscope is provided with a telescope of approx. power 4, movable between pivot screws, 

 also with a prism-system of 9 dispersion. The spectrum is consequently greatly extended. The 

 construction is similar to that of the Janssen- Hofmann Spectroscopes and the gap is very accurately 

 T'onstriifted and adjustable^ With scale and comparison prism, in case. 



54.120. Pocket Spectroscope after Vogel, Figure, with direct-vision prism and with com- 

 parison prism in case 



54.121. - - i d e m, without comparison prism, Figure, in case 



54.122. Stand for Vogel Spectroscopes Nos. 54,120/1, cf. Figure, without Spectroscopes . . 



54.123. Pocket Spectroscope after Browning, Figs. A, B, C, with scale, comparison prism, 

 symmetrical gap and lens disc after Martens, in case 



The gap distance in this instrument is fixed. The sharp focussing for different eyes is brought 

 about by an excentric disc with six louses of different powers. 



54.124. Pocket Spectroscope as No. 54,123, but with easily removable cap, reflecting prism 

 and Beckmann electric illuminating device, with three dry cells in small box . . . 



54.125. -> idem, with wave-length scale 



54.126. Universal Stand, for use with lS 7 os. 54,120/5, Figs. 54,123 B and C, with illuminating 

 mirror, stage and clamp for the spectroscope, one absorption trough, one absorption 

 tube. Price without Spectroscope 



I'm investigations on weakly absorbent solutions or on solids the spectroscope is placed verti- 

 cally see illustration. 



s. d. 

 5. 10. 



2. 5.0 

 1. 13. 

 0. 12. 



4. 15. 



7. 10.0 



8. 0.0 



3. 5.0 



Cl. 1396, 5951, 3802, 1400, 

 1401, 1398. 



