Franz Schmidt & Haensch, Berlin S. 75 



f) H. W. Vogel's Large Spectrograph mounted upon a 



Fig. 9. 



standard, with 2 Kutherford prisms of 45 mm height and bilateral slit; 

 prisms and telescope automatically connected. (Fig. 9.) 



IT. Spectrometers according to Victor von Lang. 



These instruments are mounted upon a tripod stand fitted with 

 elevation screws. The tripod supports a gun metal pillar into the bore 

 of which fits a steel center to which is attached the steel circle. 



a) Small size. Magnification of telescopes 8. The collimator is 

 fitted w j ith micrometer slit and reflecting prism. The positive ocular of 

 the observing telescope may be replaced by a Gauss ocular. The circle 

 is divided in l / 2 degrees and reads by two verniers to minutes. 



b) Medium size. Magnification of telescopes 10. Telescope and 

 collimator. tube in fixed adjustable bearings. The diameter of the divided 

 circle is 170 mm. It is divided in 1 / 3 degrees on German silver, reading 

 to 30 seconds by the two verniers. 



