500 



Spectrum Analysis and Synthesis. 



No. 53975 - 



53 988/94. 1 : 4. 



53 995. 1 : 3. 



53 996. 1 : 6. 



s. d. 



Prisms of Rock Crystal, the refracting edge ground perpendicular to the optical axis, with 

 two polished square surfaces: 



List No. 53,975 53,976 53,977 53,978 53,979 53,980 



Side, approx. mm 20 25 30 35 40 50 



1.5.0 1.10.0 2.0.0 2.10.0 3.5.0 4.10.0 



The rays which traverse the prism at minimum deflection are parallel to the optical axis. 



Prisms of Rock Crystal, the refracting edge ground parallel to the optical axis, with three 

 polished square surfaces, showing double refraction: 



List No. 53,981 53,982 53,983 53,984 53,985 53,986 

 Side, approx. mm 20 25 30 35 40 50 



1.5.0 1.10.0 2.0.0 2.10.0 3.5.0 4.10.0 



Prism Stands, with height adjustment, cf. Figs. 53,987 94; the prisms can be rotated about 

 two horizontal axes perpendicular to each other. 



List No. 53,988 53,989 53,990 53,991 53,992 53,993 53,994 





 Without Prism 0. 18. 0. 18. 1. 0. 1. 0. 1. 4. 1. 4. 1. 10. 



The preceding prices include the cementing in of the prisms if the latter are ordered at the same 

 time as the Stands. 



53.995. Crossed Prisms after Newton, Fig. 53,995, of plate glass, side 30 mm (Gan.-Man. 



Fig. 364; Gan.-Atk. Fig. 554) ............ .............. 2.16.0 



53.996. Double Prism on Stand, Figure, of Crown and Flint Glass cemented together, 



25 mm side, 50 mm length; for showing the varying refraction of different media . 1.16.0 



53.997. --idem, 30 mm side, 60 mm long ..................... 2. 0. 



53.998. Polyprism on Stand, of three kinds of glass cemented together, 25 nun side, 40 mm 

 long ..................................... 



2. 0.0 



53,999. - - i d e in, 30 mm side, 60 mm long ..................... 2. 10. 



54.000. --id o in, F i g n r c, of five kinds of glass cemented together, 25 mm side, 40 nun 



long, on Stand ................................ 2. lo. u 



54.001. -- idem, .30 mm side, 60 mm long ..................... 3. 5. 



54.002. Polyprism, of four kinds of glass :ui<! a Quartz Prism cemented together. '2~> mm side, 



40 mm long, on Stand ............................. 3. 0. d 



54.003. --idem, 30 mm side, 60 mm long ..................... 4. 0. 



Stages for Prisms: see. Nos. 54,061, p. 503. ci. 1324, isss, 5769. 



