1 8 ELEMENTARY PHOTO-MICROGRAPHY. 



on a 3in. x lin. slip must be considered as coming 

 under the head of ordinary photography. 



A piece of very strong cardboard or thin wood is 

 next cut to fit the end of the enlarging camera, and 

 in the centre a hole 4in. x 3in. for a quarter-plate, 

 or 3in. square if a lantern plate is to be used, is made. 



1 prefer the lantern plate size myself, as in 

 many instances it does away with the necessity of 

 making a positive, the negative itself making as good 

 a slide as if a positive were taken from it. For many 

 objects I even use a size still smaller 3^ in. x 



2 }/8 in., or the ordinary quarter-plate cut in two. 



A glass cutter (price one shilling) will enable the 

 owner to utilise his plates with great economy at 

 times, if such be any consideration. For testing 

 exposure a cut plate will do* quite as well as a 

 whole one. Consequently, the disappointment of 

 wasting material is not felt so keenly. 



Whatever size be adopted, after cutting the hole 

 %'m. less than the plate each way, strips of card- 

 board must be glued down each side of the aperture 

 to form grooves into which the plate may be inserted. 

 Another strip on the bottom will keep it from drop- 

 ping. These grooves should be wide enough to 

 receive both a dry plate and a backing piece of 

 black cardboard to keep any light from the back 

 of the sensitised plate during exposure. 



A slip of ground-glass, to 1 be used as a focussing 

 screen of the same size as the plate, must also be 



