06.03.2015 Views

Opticks 1717 - Up

Opticks 1717 - Up

Opticks 1717 - Up

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

ound number ) the, gOth exert of an Tech;<br />

T%is is the thickness of the Air at the darlrefi<br />

part of the firl”c dark 1113ing made by perpendicuIar<br />

ffay~, and’ half this thickn& multiplied<br />

by the Progreffion, 5, 3, rr 7, 7, :r. rP @Tic. gives<br />

the thicknei& of the. Air nt the molt: luminous<br />

3 ’<br />

1<br />

7 ‘2<br />

y 178000 -- ’ Gc. their arithmetical<br />

15) I 78000

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!