Subject ASC00030oj
The Journal of the Quekett Microscopical Club.
ser. 2, v. 14 (1919-1922), Page 81 (1919-1922)
MBLWHOI Library
BHL Page 27491137
Keywords
microscope microscopy focus iris light source mirror iris diaphragm focal plane Petzval condenser diagram four alternative 4 method illuminate light plane slide focal objective substage diaphragm petzval bull's eye source DIAGRAM TO SHOW THE FOUR ALTERNATIVE METHODS OF ILLUMINATION REFERRED TO IN THIS PAPER. illumination