552 



Polarisation of Light. 



No. 54595 



54597. 1 : 10. 



54 595 A. 1:10. 



54 595 B. 1:10. 



51 074. 1 : 4. 



54 600. 1 : 6. 



* 54,595. Demonstration Analyser for polarised light, after Grimsehl, Figs. A and B (Ztschr. 



f. d. phys. u. chem. U. 18, 1905, p. 322), consisting of a screen on stand with one 

 four-sided pyramid of black glass plate and one black glass sphere on haft .... 



Fig. A shows a reflected image of the pyramid produced on the analyser screen by the polariser 

 No. 54,594; Fig. B showing a reflected image of the glass sphere. When the polariser is rotated the 

 images rotate along with it. 



* 54,596. Plate of Mirror Glass with Haft, for insertion as an analyser in the screen of No. 54,595 



(Ztschr. f. d. phys. u. chem. U. 20, 1907, p. 219) 



#54,597. Glass Tube for Polarisation Experiments with Liquids, aftor Grimsehl, Figure 

 (Ztschr. f. d. phys. u. chem. U. 18, 1905, p. 324), with two stands, closed on one side 

 by a plane glass disc, with stopper; for use with polariser No. 54,594 



The liquids to be tested water or sugar solution are rendered cloudy by the addition of 

 a considerably diluted alcoholic mastic solution. The illuminated straight zone of the water and the 

 spirally twisted zone of the sugar solution respectively rotate when the polariser is rotated. 



* 54,598. Auxiliary Apparatus after Grimsehl, for objectively demonstrating the Calc-spar cross 



(Ztschr. f. d. phys. u. chem. U. 20, 1907, p. 219, Fig. 11), with reflex polariser . . 



* 54,599. Demonstration Polarisation Apparatus, direct vision, after Grimsehl, arranged for 



inserting preparations (Xtsclir. f. d. phys. u. chem. U. 18, 1905, p. 325, 326, Fig. 6) 



This apparatus consists of two movable polarisers No. .~>4.."i!l4 connected together, one of which 

 acts as an analyser. It is possible to demonstrate objectively with them the ordinary phenomena of 

 polarisation by using a projection lantern arid a transparent screen No. 51.003. 



s. d. 



1.15.0 



0. 6.0 



1. 8.0 



2. 0.0 



1.10.0 



* Can be used with the Projection Apparatus. 



a. 3807, 3809, . 

 3808,317. 3:. 



