Franz Schmidt & Haensch, Berlin S. 69 



c. Large Spectrum Apparatus. 



Mounted upon cast iron tripod stand having a conical brass pillar 

 surmounted by a large dish-shaped plate upon which the scale and the 

 scale telescope are rigidly fixed. The observation telescope is made to 

 revolve about the vertical axis of the instrument. The heavy flint glass 

 prism is 45 mm high and is encased in a large black brass hood with de- 

 tachable cover. The telescope magnifies 10 times, or more if desired. 



d. Large Spectrum Apparatus. 



Built after the original of Kirchhoff and Bunsen, mounted upon 

 a large iron tripod having a stout column surmounted by a large iron 

 stage plate, with 4 flint glass prisms of 500 mm height and 4 telescopes 

 (slit, scale, observing and reading telescopes). The objectives of the 

 slit and observing telescopes have a focus of 470 mm and an aperture 



Fig. 3. 



of 45 mm; the magnification of the latter is 40 and 60. To the observ- 

 ing telescope, which is attached to the stage plate, is connected a plane 

 mirror placed below the stage plate, and by means of a separate reading 

 telescope any position of the observing telescope with respect to large 

 wall diagrams may be read off. (Fig. 3.) 



e. Large Spectrum Apparatus with automatic connection of prisms. 



Mounted upon cast iron tripod fitted with levelling screws,- fixed 

 circle and movable alhidada, Rutherford prisms of 4 cm height with 

 automatic connection ; dispersion between A and H 44. The automatic 

 movement is so arranged that 1, 2, 3 or 4 prisms maybe brought into 

 play. 



