556 



Polarisation of Light. 



Xo. 54 620 - 



54 628. 1 : 3. 



54 626. 1 : 4. 



54 633. 2 : 5. 



54 627. 1 = 2. 



* 54,626. Polarisation Apparatus after Mach, Figure, with rotary analyser (M. P. II, 2, 



Fig. 812 [II, 1, 749]), with 2 Nicol prisms, one of which rotates, with gap attachment, 

 diaphragm attachment, glass press, object holder and direct-vision prism 



* 54,627. Wedge Compensator after Babinet, F i g u r (M. P. II, 2, Figs. 764, 765 [II, 1, 



Figs. 814, 815]), 2 wedges cut parallel to the axis, in mount 



* 54,628. Compensator after Soleil, 2 wedges and compensating plate, in brass mount, Figure 



(M. P., 10 th Edn., II, 2, Fig. 766) 



54.629. Polariscope after Savart, in brass mount 



54.630. - - after Babinet 



54.631. - - after Se"narmont 



54.632. - - after Bravais 



54.633. Fresnel's Parallelepiped, Figure, in brass mount (M. P. II, 2, Fig. 884 [II, 1, 827]) 



Paalzow Optical Benches. 



* 54,634. Large Paalzow Optical Bench, F i g u r e, for experiments on Double Eefraction, on 

 Polarisation in parallel and converging light, on Interference and Diffraction, on Spec- 

 trum Phenomena and on Microscopic Phenomena, by means of sunlight, electric light. 

 or limelight; fitting all our projection apparatus 



The optical bench consists of an iron cheek I. -2 in long, pinned and ground, resting on legs having 

 levelling screws. It is provided with a rule accurately divided in millimetres and has 7 brass stands. 



s. d. 

 13. 0.0 



5. 0.0 



6. 10. 

 0.18.0 



1. 4.0 

 1.10.0 

 1.10.0 



2. 8.0 



34. 0.0 



* Can be used with the Projection Apparatus. 



Cl. 320, 294, 

 1628, 293. 



