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A luminous body which is long and narrow in shape gives more confused outlines to the derived shadow than a spherical light, and this contradicts the proposition next following: A shadow will have its outlines more clearly defined in proportion as it is nearer to the primary shadow or, I should say, the body casting the shadow;  96 the cause of this is the elongated form of the luminous body a c, &c  97 .


110:96 14: The lettering refers to the lower diagram, Pl. XLI, No. 5.

110:97 16: See Footnote 14

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