The life of President Edwards: . or while some rays fly one way, others fly di-rectly contrary, so the agitation must needs be much greater, than wherethe direct ray and the reflex ray partly come into the same course. In-deed the surface of the Earth, with respect to its minute parts, whichreflect the sun-beams, is so infinitely uneven, that the reflex ray has equallyall directions: that is, the ray c d is not only reflected towards e, as itwould be if the sur- pj^ 3 face of the Earth ^ were a looking-glass, but is also re-flected back againtowards c, and ev-ery way else in-differently ; so t
The life of President Edwards: . or while some rays fly one way, others fly di-rectly contrary, so the agitation must needs be much greater, than wherethe direct ray and the reflex ray partly come into the same course. In-deed the surface of the Earth, with respect to its minute parts, whichreflect the sun-beams, is so infinitely uneven, that the reflex ray has equallyall directions: that is, the ray c d is not only reflected towards e, as itwould be if the sur- pj^ 3 face of the Earth ^ were a looking-glass, but is also re-flected back againtowards c, and ev-ery way else in-differently ; so thatthere is a direct op-position in the ob-lique ray, at well asin the perpendicu-lar ray. But yetthere is not so muchopposition; for allthe reflexions of theperpendicular ray,a b, are in somemeasure opposite to the direct. They are all reflected by less than a rightangle ; whereas all the reflexions of the oblique ray, c d, that are on theother side of the hne fg, perpendicular to c d, are by an angle greater thana right NOTES ON NATURAL SCIENCE. 719 Another reason why winter is so much colder than summer, is, because Fig. 4.
Size: 1919px × 1302px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookau, bookcentury1800, bookidlifeofpresiden00dwig, bookyear1830
