1786 



Journal of Applied Microscopy 



means of a Hooke's key an iron rod 11 cm. long and 5 mm. in diameter (Fig. 4). 

 The microscope is first attached to the base plate and the latter is then placed 

 in position beneath the camera. The camera is then lowered until the light 

 excluding sleeve on its lower end engages with that on the microscope. The 

 leveling screws on the plate are then adjusted until the two sleeves are concen- 

 tric, as determined by feeling with the fingers that the space between the two 



Fig. 4 — Shows the details of the focusing device for the coarse adjustment 

 of the microscope: the leveling plate; the metal pan in use; the re- 

 flector and support for focusing hair. 



sleeves is of equal width on all sides. In this way the optical axis of the micro- 

 scope is brought to coincide with that of the camera. The binding screws hold- 

 ing the leveling plate are then lightened. The pulley wheels are then connected 

 to the coarse adjustment screws of the microscope by means of loops of linen 

 cord, and these cords are tightened by adjusting the pulley wheels on the bar. 

 Supported from the wall by two brackets alongside the camera is a vertical 



