PLATE 18. 



Direct Colour Photomicrographs. 



Screen plate processes. Autochrome and Paget's duplicating. 



A HOOF OF HORSE x 6 



Objective ...... Seibert's No. Achromat. 36mm. focus. 



Eye-piece ...... None. 



Condense?" ... Abbe, front lens removed. 



Illuminant ... Limelight. 



Aux. Condenser Bull's-eye. 



Screen ...... Lumiere's special screen for limelight. 



Plate ...... Lumiere's Autochrome. 



Exposure ...... 5 sec. 



Positive 



... The original plate reversed. 



HORIZONTAL SECTION OF HUMAN SCALP 

 follicles. 



x 45, showing the hair 



Objective ...... Zeiss 16 mm. Apo. 



Eye-piece ...... Zeiss projection x 4. 



Condenser .. Watson's Universal, front lens removed. 



Illuminant ... 4 amp. arc. 



Aux. Condenser Biconvex lens, parallel light. 



Screen 



Plate 



Exposure 



Wratten's Kj. 



Paget, duplicating process. 



1 sec. 



The positive from which this reproduction was made, is on a Paget 

 special transparency plate, developed with Hydroquinone, and bound 

 up in register with a viewing screen. 



Photos. H L. H. 

 W. B. R. 



I To follow page 160. 



