Fk;. 17.1— American UiJlical Clompaii^s base and cameras. Permanent alii;innent of 

 microscope, lamp and camera permit quick change between visual suutv and photo- 

 graphy: top, 4x5 inch model with focusing tube: left. l\5 inch model uitliout 

 focusing tube: right, 35 mm. model with focusing ocular. 



