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The microscope and its revelations (1891)

Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 76

An illustration from The microscope and its revelations, 1891, leaf 76 — emission in-fill directions, and that the intensity of a portion of the pencil takenclose to the perpendicular is identical with that of another portionof equal angular extension, but more removed from the perpendicular.On this view, therefore, the quantity of light contained in any givenpencils… … Fig. 33.—Diagram showing erroneous inference as to the intensity of emitted rays. those obtained by estimating in the above manner the amount oflight in the solid cones, and some perplexity naturally arises fromthe supposition that the measure of the aperture of the objective doesnot correspond to…

Microscopy

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$An illustration from Opticks: or, A treatise of the reflections, refractions, inflexions and colours of light. Also two treatises of the species and magnitude of curvilinear figures (1704)$