510 



Spectrum Apparatus. 



N'o. 54111 



54 113 A. 1:2. 



54113B. 1:2. 



54 112. 1 : 6. 



54 117. 1 : 2. 



54116. 1=4. 



54 118. 1 : 2. 



54 119. 1 : 4. 



54.111. Spectroscope after Mousson, very simple (M. P., 9th. Edn., II, 1, Pig. 196) . . . 



The spectroscope has an adjustable stand, gap with comparison prism and micrometer screw, 

 gap-tube with lens of 160 mm focal length, also an extra heavy flint glass prism. 



54.112. -- idem, without comparison prism, Figure '2.16.0 



s. d. 

 3. 0.0 



54.113. School Spectroscope, F i g s. A and B, consisting of a Gap-tube with gap and Ions 

 and two extensions, one with a direct-vision prism and a second with a Flint Glass 

 Prism 



54.114. Cap for above with aperture for containing reagent glasses, with 6 reagent glasses 



54.115. Stand for No. 54,113 to enable the apparatus to be tilted 



54.116. Students' Spectroscope, very simple pattern, Figure, with triple prism (direct- 

 vision), non-adjustable gap, on wood stand for convenience of manipulation .... 



54.117. Pocket Spectroscope with Diffraction Grating, Figure, showing hundreds of lines 

 in the solar spectrum; the D line is split up 



A good imitation of a genuine Rowland Grating is used as Diffraction Grating for the instrument. 



54.118. Pocket Spectroscope with Diffraction Grating and Reading Device, F i g u r < 



A brilliantly illuminating arrow, visible above the spectrum, can be placed on a difinite line by 

 means of a milled wheel. By means of a special lens, fitted alongside the eyepiece, tin- position of the 

 arrow can be read off externally on a scale; the readings correspond to the momentary wave-lengths. 



fl. 13<in. .1040, 



4151, 1393, 



4152, 1395 



1. 15. 



0. 7.0 

 0.11.0 



1. 6.0 

 3. 0.0 

 5. 0.0 



BMQ, 



