on of apparent movement in focusing down with referenceto the illuminating ray ? What in focusing up ? If one understandsthis experiment it may sometimes save a great deal of confusion. ( Seeunder testing the microscope for swaying with central light § 104). CM. II.-\ LIGHTING AND FOCUSING. 47 §… … 48. 49- 5°- 5i- Figs. 4S-51. Sectional views of the Abbe Illuminator of 1.20 N. A. showingvarious methods of illumination (J 84). Fig. 4S, axial light with parallel rays.Fig. 49, oblique light. Fig. 50, axial light with converging beam. Fig. 51, dark-ground illumination with a central stop…
Microscopy
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