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In like manner the light upon every white wall, on a cloudless day, may be regarded as produced by the superposition of innumerable images of the sun. The law that the angle of incidence is equal to the angle of reflection has a bearing upon theory, to be subsequently mentioned, which renders its simple illustration here desirable.
Professor Wiener thought he could draw from his experiment a firm conclusion on the point in dispute. He produced stationary waves with light polarized at an angle of 45°, and established that, when light is polarized in the plane of incidence, the fringes persist; but that, on the other hand, they disappear when the light is polarized perpendicularly to this plane.
It consists of two layers, an outer fibrous and an inner cellular layer; the cells, which are called osteoblasts, are continuous with those lining the Haversian canals and the medullary cavity. The arrangement of the blood vessels determines to some extent the incidence of disease in bone.
When the machine is moved through the air, as in gliding, the discrepancy seems much less marked. That the ratio of drift to lift in well-shaped surfaces is less at angles of incidence of 5 degrees to 12 degrees than at an angle of 3 degrees.
The Dunne Bi-plane. This is a true deltoid formation, as the angle of incidence of the planes is so disposed that when the planes are horizontal from end to end, the inclination is such as to make it similar to the deltoid kite referred to.
Having got his balance, he obtained a lifting angle of incidence on the wings by means of his levers, and released the hook that secured the machine, gliding off over the quarry.
For we see that every case in the law courts conforms in the major part to the genuine class; but always, or nearly always, it presents some one differential feature peculiar to itself; and the question about it always is, Whether the differential feature is sufficient to take it out of the universal rule, or whether, in fact, it ought not to disturb the incidence of the legal rule?
Where the mental and social conditions are such that men seriously believe the incidence of natural forces on mankind to be determined by the direct action of "God," one can appreciate right belief concerning him being treated as of first rate importance. In such circumstances wrong ideas are the equivalent of disaster. But we are not in that condition to-day.
The important fact is that the original symmetrical structure of the larva and the asymmetrical structure of the adult Flat-fish correspond to the different positions of the body of the fish in relation to the vertical, the horizontal ground at the bottom of the water, and incidence of light.
But he whose message is for minds attuned and tempered will beware of needless reiteration, as of the noisiest way of emphasis. Is the same word wanted again, he will examine carefully whether the altered incidence does not justify and require an altered term, which the world is quick to call a synonym.
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