Modern microscopy; a handbook for beginners and students (1912)
Cross, M. I, Cole, Martin J · Chicago, Chicago Medical Book Co. · leaf 133
_^I n s L — … F X S F c. Fig. 49.—Diagrams showing the Effect of placing the Bulls-Eye Con-denser at Different Distances from the Source of Light. increase of light is obtained in excess of that of the illuminant;all that it does is to collect and concentrate that light ; andMr. A. E. Conrady, in connection with…
Microscopy
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