| 745 | 746 | 747 | 748 | 749 |
| 1 | 306 | 613 | 919 | 1225 |
|
reaches the horizon; take a lens which is highly convex on one
surface and concave on the opposite, and place the concave side next
the eye, and look at the object beyond the convex surface; by this
means you will have produced an exact imitation of the atmosphere
included beneath the sphere of fire and outside that of water; for
this atmosphere is concave on the side next the earth, and convex
towards the fire.
9
10.
Construct glasses to see the moon magnified.
[Footnote: See the Introduction, p. 136, Fracastoro says in his work
Homocentres: "Per dua specilla ocularla si quis perspiciat, alteri
altero superposito, majora multo et propinquiora videbit
omnia.--Quin imo quaedam specilla ocularia fiunt tantae densitatis,
ut si per ea quis aut lunam, aut aliud siderum spectet, adeo
propinqua illa iudicet, ut ne turres ipsas excedant" (sect. II c. 8
and sect. III, c. 23).]
I.
THE STARS.
On the light of the stars (911-913).
9
11.
The stars are visible by night and not by day, because we are
eneath the dense atmosphere, which is full of innumerable
747
Page
Quick Jump
|