Monypenny— 8 





.^^' 



- ... s- 





Vx^.^ 







A. — Laminated lY^aiiite and Feiritc. — x 3,500 reduced to 3,000 

 Zeiss 2 m/m. apochromat. N.A. 1.4., nonochromatic blue 



lig-ht. (Neg-ativc x 1,000 and enlarged.) 

 B. — Pearlite (finer than A) and Ferrite. — x 3,500 reduced to 

 3,000. Watson 2 m/m. " Holos " N.A. 1.35, yellow green 



light. (Negative x 1,400 and enlarged.) 



