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A moment's reflection will make it plain that the wider the slit the less will be the obliquity of direction needed to produce the necessary difference of path. With a wide slit, therefore, the bands, as observed, will be closer together than with a narrow one. It is also plain that the shorter the wave, the less will be the obliquity required to produce the necessary retardation.
That it is not absolutely certain, after all, whether the moon's mean motion is undergoing acceleration, or the earth's rotation retardation. And yet this is the key of the whole position.
The bright pupils are retarded in their work, for they are capable of much more than they do. In such cases the retardation is not on account of the inability of the pupil but on account of the system. The bright ones are held back in line with the slow. This need not be the case in rural schools.
That it is not absolutely certain, after all, whether the moon's mean motion is undergoing acceleration, or the earth's rotation retardation. And yet this is the key of the whole position.
He further supposed that the depth from which these vertical currents rose, and consequently the amount of retardation effected by their ascent to the surface, became progressively greater as the poles were approached, owing to the considerable flattening of the spheroidal surface from which they started; but the adoption of this expedient has been shown to involve inadmissible consequences.
Then came a sudden retardation, instantly followed by an inexpressibly disconcerting tilt downward of the machine. That I still recall with horror. I couldn't see what was happening at all and I couldn't imagine. It was a mysterious, inexplicable dive. The thing, it seemed, without rhyme or reason, was kicking up its heels in the air.
In childhood, the subthyroid or thyroid deficient, the cretinoid type, the type resembling the cretin, is fairly common. The peasant's face, with the broad nose and the tough skin, coarse straight hair, the undergrowth, physical and mental, a persistent babyishness and a retardation of self-control development, make up the picture.
"Pardon me, Don Manuel," interrupted George, who was already beginning to suspect a disposition on the part of this individual at least to set up a system of delay and retardation of proceedings, "I do not think we need enter upon a discussion of my demands as a whole just now.
Thanks largely to his own experiments, but partly also to the efforts of others, he had come, before the end of his life, pretty definitely to realize that the motion of a projectile, for example, must be thought of as inherent in the projectile itself, and that the retardation or ultimate cessation of that motion is due to the action of antagonistic forces.
But limitations or privations result from the original imperfection of creatures which restricts their receptivity. It is as with a laden boat, which the river carries along more slowly or less slowly in proportion to the weight that it bears: thus the speed comes from the river, but the retardation which restricts this speed comes from the load.
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