Fig. 11. 



Centring' Achromatic Condenser 



No. 29. (Full Size.) 



Fig. 12. 



Centring Appliance for Objective as Condenser 

 No. 32. (Full Size.) 



No. 32. *Centring Appliance for Microscope Objectives used as 

 condensers. Fig. 12. 



In many instances it appears desirable to use achromatic, or also apochromatic, ob- 

 jectives as illuminators instead of the condensers specified above. For this purpose we 

 supply a sliding sleeve with centring collar into which such objectives [may be screwed 

 and which fits into the sleeve of the illuminating apparatus. 



No. 34. *ENGELMANN'S Micro-Spectral Objective, for observing the 

 effect of individual colours of the spectrum upon microscopical objects (see Bot. 

 Zeitung, vol. XI,, 1882,1 pp. 419426; also PFLtJGER's Archiv f. d. ges. Physiol., 

 vol. XXVII, 1882, pp. 485490). 



No. 35. *ROLLETT'S Spectro-Polariser, as modified by DIPPEL, for 

 determining the character and degree of double refraction in microscopical ob- 

 jects (see Zeitschrift f. Instrumentenkunde, vol. I," 1881. pp. 366 372, and DIPPEL, 

 loc. cit, p. 619). 



With selenite films for red of the II. and red of the III. order. 



No. 36. Centring Appliance for the apparatus under Nos. 34 and 35. 



Centring Appliance for Micro-objectives used as Con- 

 densers 



ENGELMANN'S Micro-spectral Objective, in case .... 

 ROLLETTS Spectro-Polariser, in case 



Centring Appliance for apparatus specified under Nos. 34 

 and 35 



Marks Codeword 



12. Parabanda 



160. Paradigma 



200. Pnradnra 



8. Parafraste 



