546 



Interference and Diffraction. 



No. 54 532 



54 539. 1 : 2. 



54 532. 1 : 9. 



54536. 1:10. 



54 537. 1 : 4. 



54 540 A. 1:9. 



54.532. Adjustable Gap, can be used vertically and horizontally, Figure, on Stand . . 



54.533. - - idem, with Micrometer Screw . 



54.534. Adjustable Gap with iris diaphragm, cf. Fig. 50,988, p. 176, on stand; the length of 

 the gap can also be altered by the iris diaphragm 



54.535. - - idem, with Micrometer Screw 



Adjustable Gaps for the Projection Lantern: sec under Nos. 50,985 50,988 a, pp. 175 and 176. 



54.536. Interference Prism (bi-prism) after Fresnel, Figure, with diaphragm (M. P., 

 10 th Edn. II, 1, Fig. 604), 30x40 mm, on Stand 



54.537. Billet's Half-lenses, Figure, plano-convex, adjustable by micrometer screw, on 

 stand, 60 mm diameter (M. P. II, 1, Fig. 605 [587]) 



54.538. Lens of short focal length, for observing the interference bands, on Stand .... 



54.539. Analyser after Dele/cnne, Figure, with two small parallel mirrors, for the inter- 

 ference bands, in brass mount with haft 



M. 3408, 



1581, 326", 

 308. 



s. d. 

 1. 6.0 



1. Iti. 



L>. 11.0 

 3. 1.0 



1. 8.0 



2.10.0 

 0.16.0 



1. *.<> 



1583, 



