508 



Spectrum Apparatus. 



No. 54 097 



54 100. 1 : 7. 



54 101. 1 : 6. 



54,097. School Spectrum Apparatus, Figure 



The apparatus has a 60" prism constructed of medium heavy flint glass and fitted on a brass 

 plate 92 mm diameter on which is mounted the telescope, with scale. The observing telescope and 

 gap tube are placed on the two arms, rotating on a trunnion, and situated underneath the plate. 

 The arm carrying the observing telescope is movable and can be firmly clamped in any position in order 

 to observe the spectrum conveniently. The observing telescope and gap tube have an aperture of 

 20 mm, a focal length of 150 mm, and a magnification of 5. The gap has a micrometer screw and, 

 for the purposes of better demonstration, a Comparison Prism which can be switched out of operation. 

 Dispersion 4". The stand has height adjustment. 



s. d 

 4. 10. 



54,098. the 

 Prism 



same Apparatus, but without Telescope and Scale or Comparison 



4. 0.0 



Goniometers and Spectrum Apparatus for students' exercises, after Grimsehl (Ztschr. f. d. 



phys. u. chem. U. 17, 1904, p. 207), see No. 53,818, p. 481 2. 8. 



54.099. Spectrum Apparatus for Chemical and Pharmaceutical Researches, F i g u r c, arranged 



for setting up horizontally and vertically 10. 0. 



When the apparatus is set up vertically both the sunlight and flames tit various heights can be 

 observed. A heavy flint glass prism (60) is enclosed in a tightly fitting cap. 



54.100. Spectrograph, F i g u r c, consisting of a Spectroscope combined with a Photographic 

 Camera 13x18 cm ,12. 10. 



The spectroscope contains 1 <|iiintuple direct-vision pri-m. 1 triple eollimator objective of 20 mm 

 aperture, 1 single micrometer gup slider with divided drum. The camera r;m lie rotated in the vertical 

 plane and a rack is provided tor sharp focussing. The ground gluss disc aud the dark slide can be 

 displaced vertically so as to admit of ,"> exposures being made on one plute. The apparat us is specially 

 suitable for investigating colour-sensitive plates and for teaching purposes. 



CI. 1385, 1387, 

 1388. 1388. 



