492 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



focus and the distance]from |lens to plate 10 in. Monochromatic light 

 is recommended. The camera has rack-and-pinion movement on a base- 

 board having two rigidly attached arms extending forward and carrying 

 pins to engage in the screw-holes of the brackets. Slots were cut into 

 the screw-holes so that the pins dropped into place and an automatic 

 lock prevented the pins from being lifted out except when the camera 

 was swung below the horizontal plane. An adjustable telescopic strut 



Fig. 102. 



and detachable extension to the base-board supported the camera and 

 fixed it at any desired inclination. Fig. 102 shows the device as fitted 

 to a Swift folding Microscope, and the author seems to have been very 

 well pleased with his results. 



Photomicrography with Simple Apparatus.* — Katherine E. Golden 

 obtains good results with the following " home-made " apparatus (fig. 103). 

 An inch board about 40 in. long and 12 in. wide carries near the lower 



* Journ. App. Micr., v. (1902) pp. 1681-3 (3 figs.). 



