554 



Polarisation of Light. 



No. 54 607 



54 607. 1 : 5. 



54 609. 1 : 6. 



54 610. 1 : 6. 



54 612. 1 : 4. 



54.607. Polarisation Apparatus after Norrenberg, Figure, entirely of brass, with finely 

 divided circles, glass stage rotary and movable about the horizontal axis, with one lens, 

 1 black mirror, 1 column of glass plates (M. P. II, 1, Fig. 698 [676]) 



For simpler patterns, see preceding page. 



54.608. - - idem, with 3 lenses, also with a Nicol prism as analyser 



54.609. idem, Figure, with 3 lenses, black mirror, column of glass plates, Nicol prism 

 and tube for circular-polarising liquids 



54.610. --idem, as No. 54,609, with a Vogel Pocket Spectroscope, for use as a Polarisation 

 Spectroscope, Figure 



54.611. Collection of Polarisation Preparations, suitable for Apparatus Nos. 54,602/9 and 

 54,618/20, consisting of 6 crystals and 2 rapidly annealed glasses 



54.612. Simple Polarisation Apparatus after Hartl, Figure, with wood stand, for taking 

 preparations, and in particular the rapidly annealed glasses No. 53,863 (Fr. phys. Techn. 

 II, 2, Fig. 2954) 



54.613. Polarisation Apparatus for Students' Use, after Grimsehl (Grimsehl, Ausgewahlte 

 physikalische Schtilerubungen, pp. 19 31) 



(a) Vertical and inclined glass plate with bases and Glow Lamp Holder on base for measuring 

 the angle of polarisation on glass plates ( 0.7.0); (b) Polarisation Apparatus with 2 inclined black 

 glass plates, with preparation holder, for investigations between parallel polarisers ( 0.4.0); (c) Po- 

 larisation Apparatus with crossed polarisers, with preparation holder ( 0.4.0); (d) Polarisation Appa- 

 ratus arranged on Norrenberg's principle, with rotary set of glass plates ( 1.10.0): (e) Preparations 

 suitable for above: calc-spar, aragonite, gypsum plate 2 mm thick, gypsum plate 0.5 mm thick, gypsum 

 image, butterfly ( 1. 15. 0). 



For lenses, see No. 53, 932 b; for model for explaining polarisation in a thin gypsum sheet, see 

 No. 54,686. 



* 54,614. Column of Glass Plates, Figure, formed of 15 20 thin plate glass sheets, in round 

 mount with lateral opening so as to be capable of use in transmitted and reflect cd light, 

 65 mm diameter, 110 mm long 



Black Mirrors, in mahogany frame: 



List No. 54,615 

 10x20 

 0. 10. 



Size cm 

 



54,616 

 15x30 

 0. 18. 



54,617 

 20x40 

 1. 10. 



s. d. 

 4.16.0 



6. 0.0 

 6.10.0 

 9. 0.0 

 1.16. d 



0.10.0 

 4. 0.0 



1.16.0 



* Can be used with the Projection Apparatus. 



Cl. 1615, 1616,4814,5569. 



