30 Introductory Biology 



Cuff, in 1744^ made a microscope of brass which was only twelve 

 inches high and had a fine screw adjustment and an eyepiece for meas- 

 uring the size of objects. 



Wollaston developed a camera lucida in 1807 for making drawings of 

 microscopic objects. 



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Fig. 3. — Horizontal microscope of Bonannus (1691). This type included a 

 source of light, a condenser to concentrate light on the specimen, and a rack-and- 

 pinion focusing mechanism on a horizontal stand. (From the Evolution of the 

 Microscope, American Optical Company, Instrument Division.) 



Fig. 4. — Wilson's microscope (about 1710). This model w^as made of ivory, 

 and the body was cut open and the ends threaded for the attachment of lenses. 

 The specimen was held by a spring for focusing. The handle was unscrewed 

 when carried in the pocket. (From the Evolution of the Microscope, American 

 Optical Company, Instrument Division.) 



