558 



Polarisation of Light. 



No. 54 635 



N O K K N L TV 



- 1 '! 



54641. 1:3. 



54 635 a (50 789, 54 635, 54 639). 1 : 10. 



Polarisation in converging light with 2 Xicol prisms and 

 2 condensers, for uniaxial and bi-axial crystals. 



H 



W 



54 635 b (54 635, 54 639, 54 649). 1 : 10. 



Polarisation in parallel light with 1 Nicol as polariser 

 and 1 double-refracting prism. 



54 635 c (54 635, 54 645, 54 647). 1 : 10. 



Polarisation with Column of Glass Plates 

 and Black Mirror. 



The collections for different experiments are represented in Figs. 54,635 a f; the projection apparatus, 

 should be imagined as being to the right of the optical bench and the projection screen to the left. 



C = Collimator Lens, K = 



D = Direct -vision Prism, 



F = Adjustable Gap, L = 



= Glass Plate Column. M = 



H = Rotary Object Holder, N = 



In the illustrations 



Condenser with Preparation O = 



Holder. P = 

 Bi-concave Lens, 



Projection Microscope, S = 



Nicol Prism. W = 



Open Objective, 

 Double - refract in. u 



Prism, 



Black Mirror, 

 Water Trough. 



* 54,635. Small Paalzow Optical Bench, Figs, a f, with tall legs, for experiments on Double i s. d. 

 Infraction, Polarisation in parallel and converging Light, on Spectrum Phenomena 

 and on Microscopical Phenomena 16. 0. O 



This optical bench consists of a polished stand of mahogany with two metal rails. 



Given in are the following: 

 7 simple stands sliding on the rails. 



1 Water Trough ( 2.0.0) for continuous cooling, for condensers to 122 mm diameter (when using 

 projection lantern having larger condensers a larger trough, at an extra price of i 0. 10. 0, should 



projection lantern having larger em 

 be employed, see List No. 50,977). 



* Can be used with the Projection Apparatus. 



'l. 302, 291. 

 303. 304. 



