The ray of the sea and of the moon is warm close by.

Sun. If the ray reflected from the image of the sun in the water is gathered by a concave mirror, then, once it is reflected by that mirror, it will burn. The same will be done by that of the full moon.

ad-bc-fg-hi-KL. Many are the rays of the luminous body that reflect outward from the mirror by a divergent course; and many are those that reflect inward by a convergent gathering.

The sun is never seen halved, but much less. Various curvatures reflect at various distances, if the magnitude of the mirror is of immense variety from one to another. If their curvature does not vary, the convergence of the rays along its length will not vary.

And various sizes with equal curvature reflect at various distances, by the contrary reasoning.

mn-a-a-b-po. If the intersection of the rays coming to the mirror is necessary, it will be necessary that they serve a single curvature of mirror, and consequently they will always reflect at one same distance, given that the mirror is of one same size; and various sizes would reflect at various distances, the concavities being equal among themselves.

6 36 - 6 36.

3 3 6 7 7 - a.

ac-e-o-f-db. There is a difference between rays passing through an aperture and passing freely through the air, because the rays passed through apertures have one part that intersects and one part that does not. Those intersect that depart from the edge toward the middle of the luminous body. Those do not intersect that depart from the middle of the luminous body in such quantity as that of the aperture; and this convergence of rays has a columnar figure. But if the luminous rays pass freely through the air, no intersection occurs here. And if you were to say that the intersection were in that air near the aperture, I will grant it to be both outside and inside and through all the opposite distances, before and after such aperture; and from the edges of the luminous body depart rays that intersect before the aperture, and also rays that intersect within such aperture, and from the same edge points of the luminous body depart infinite rays that make infinite intersections between the first intersection, made outside the aperture, and the second intersection made within the aperture, that is between e and f.

Perspective (optics). And if you wished such rays to pass through the center of the mirror, it would be necessary that such rays not be straight, except for the central ray.

A cauldron cast in one piece.

a b. Cupel-bone and oil of tartar: and this too is good for soldering copper, as is seen at a b. And such a mixture is to be placed behind, and the ... To make the hollows (molds) take plaster and form, and then put in the furnace and soak with strong glue; then dry well, and this will receive the thin plate. And of the horse make first its whole half, then give it the iron armature. And make first all the pieces, and by yourself, in secret, put them together.