76 PHOTO-MICROGEAPHY 



which is graduated to minimetres. Through the kindness of the firm a block of the 

 arrangement is given herewith, which explains itself, Fig. 41. 



Fig. 41 Fig. 42 



Baker's Removable Stage 



Fig. 43 



The Mayall pattern, to which we have referred and which is still much used is 

 shown in Fig. 42, as made by Messrs. Baker, and in Fig. 43, as sold by Zeiss. 



