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Página 51
The rate must also be the same at equal distances above and below this plane of reference . The curvature of a horizontal , or nearly horizontal ray , will thus be simply proportional to distance from the plane of reference , and the ...
The rate must also be the same at equal distances above and below this plane of reference . The curvature of a horizontal , or nearly horizontal ray , will thus be simply proportional to distance from the plane of reference , and the ...
Página 52
being always a point at the sun distance on the other side of the plane of reference , and the horizontal distance between the two being the same as in the preceding case . This property is illustrated by Fig . 2 .
being always a point at the sun distance on the other side of the plane of reference , and the horizontal distance between the two being the same as in the preceding case . This property is illustrated by Fig . 2 .
Página 69
1 and 2 ; and we can now afford to dispense with the difficult physical postulate of a diminution of density downwards from the plane of reference . One of the rays in Fig . 3 is everywhere concave downwards , and therefore the air ...
1 and 2 ; and we can now afford to dispense with the difficult physical postulate of a diminution of density downwards from the plane of reference . One of the rays in Fig . 3 is everywhere concave downwards , and therefore the air ...
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