No. 54647. 



Paalzow Optical Benches. 



559 



54 635 d (54 635, 54 649). 1:10. 

 Double refraction with 1 or 2 double-refracting prisms. 



54635e (54635, 54666, 50982, 50986). 1 : 10. 

 Spectrum Phenomena with a direct-vision prism. 



N 



M 



N 



54635! (54635, 54639, 51048, 54639). 1 : 10. 



Microscopic Polarisation Phenomena in converging light 



(can also be used as Projection Microscope). 



54643. 1 : 3. 



1 Bi-concave Lens in mount ( 0. 18. 0) for producing parallel rays (when ordering size of condenser 

 of lantern should be quoted). 



1 Rotary Object Holder ( 1. 5. 0). 



1 Open Objective ( 1. 10. 0). 



2 Bearings for Nicol Prisms ( 0. 10. 0). 



2 Condensers ( 4. 0. 0) for producing converging rays, with preparation holder. 



The preceding optical bench is specially adapted for experiments Nos. 1 9 and 11 13 included 

 in the remark to List No. 54,634. If the bench has to be arranged for interference and diffraction 

 experiments (see No. 10) also, it must be constructed longer, the extra cost being 2. 0. 0. 



s. d. 



Auxiliary Apparatus for Experiments on Polarisation and Double Refraction, Figs. 54635 a, i>. c, d. 



54,636. Nicol Prisms in brass 

 mount, polariscr 35 mm, ana- 

 lyser 28 mm 50. 



f 54,637. idem, polariser 30 mm, 



analyser 24 mm 30. 



The prices of the Nicol 

 prisms are only approximate 

 and liable to vary. 



54,638. Divided Circle and Index 

 on the prism mounts .... 



t 54,639. 2 Nicol Prisms in brass 

 mount, polariser 25 mm, ana- 

 lyser 22 mm, Fig. 54,635 b (N) 

 and 54,635 f (N), quality I . 

 .54,640. idem, polariser 25 mm, 

 analyser 20 mm, quality I . 

 The prices of Nicol prisms 

 are only approximate and sub- 

 ject to variation. 



For large 



Paalzow 



Bench 



No. 54,634 



S. d. 



0. 



0. 



For small 



Paalzow 



Bench 



No. 54,635 



s. d. 



Prices 

 vary 



1. 10. 



Prices 



22 - 10 ' 

 1 20. 0. 



The items marked f are absolutely necessary 

 for carrying out the experiments. 



For large 



Paalzow 



Bench 



No. 54,634 



s. d. 



3. 0. 



Cl. 305, 306, 

 307, 292. 



For small 

 Paalzow 

 Bench 

 No. 54,635 

 s. d. 



1. 2. 1. 2. 



1 54,641. Glass Press, Figure, 



with 2 glasses, for showing that 



glass becomes double refracting 



by pressure (M. P. II, 2, 



Fig. 797 [II, 1, 790]) .... 

 f 54,642. Fresnel's Press, for showing 



that pressure makes glass 



double refracting (M. P. II, 



1, 753 [734]) 2. 15. 2. 15. 



t 54,643. Glass Bending Press, F i- 



g u r e, with 2 glass strips, for 



producing double refraction 



(M. P. II, 2, 796 [II, 1, 789]) 

 t 54,644. Black Mirror, with mount 



and haft 



t 54,645. - - idem, smaller, Fi- 

 gure 54,635 c (S) 



t 54,646. Column of Glass Plate, with 



mount and haft 



t 54,647. idem, smaller, Fi- 

 gure 54,635 c (G) 



1. 2. 1. 2. 

 1. 2. 



0. 16. 



2. 0. 



