45, CORNHILL, E.G., AND 122, EEGENT STREET, W., LONDON. 281 



SPECTRUM APPARATUS. 



FIG. 1078. 



1077 Negretti & Zambia's Pocket Spectroscope, in Brass 



Mountings, plain Slit 



1078 Pocket Spectroscope, for observing the Rain Band, 



with adjustable slit, will show many of Fraiinhofer's 

 lines (fig. 1078) 



1079 Direct Vision Rain-Band Spectroscope, larger size, of 



very great dispersive power ..... 



1080 Table Spectrum Apparatus (or Spectroscope), simple 



form for Chemical Analysis 



a. d. 



EacR. 

 s. d. 



1 15 



2 10 

 550 

 7 10 



FIG. 1081. 



1081 Spectroscope, Duboscq's arrangement, one Prism, horizontal Telescope, and 



transparent Micrometer, Gas Burner, and forceps; on adjusting Stand, 

 (as fig. 1081) 16 10 0. 



1082 Table Spectroscope, with one Prism, Eye-piece, and 



divided Circle 10 10 



1083 Ditto ditto, with Two Prisms .... 17 10 



1084 Ditto ditto, with Four Prisms .... 35 



1085 Table Spectroscope, with two Prisms, high and low 



Power, divided Circle, Comparison Prism, Micro 



Scale, two Eye-pieces in Box 14 



