ELEMENTARY PHOTO-MICROGRAPHY. 27 



In describing the general arrangement, I may 

 say that the baseboard may consist of only one 

 piece, or of two preferably two pieces of wood, 

 each fin. thick, the upper piece being 2iin. long 

 x 5in. wide, free to swivel on a centre to avoid 

 the inconvenience of putting the head between the 

 camera and eyepiece whilst focussing. 



Carrying, as the baseboard does, both lamp and 

 microscope, the adjustments are not altered while 

 turning it on its pivot. The lower piece is widened 

 at one end to suit the camera used a quarter- 

 plate is best and has flanges at each side of the 

 broad part. Another board about Jin. thick 

 (fig. 5) has shallow strips at each corner on the 

 top side, into which the bottom of the camera will 

 fit tightly. 



Both camera and its carrier board will then 

 slide freely between the flanges of the baseboard, 

 and after connection with a velvet tube may be 

 secured in position by the thumbscrew. The short 

 body tube T, previously mentioned, which may 

 be bought of any working optician for a few 

 shillings, is fitted into a block of wood (fig. 3), and 

 both this and the object carrier (fig. 2) are placed 

 between the guide bars on the top of the turn- 

 table V (fig. 4). 



A narrow strip of sheet metal bent into the form 

 of a letter L, and having a screw F (fig. 3), makes 



