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Updated: June 23, 2025
That is to say, if the retardation of the light which is reflected from the second surface, owing to its twice traversing the thickness of the film, be equivalent to a wave length of the vibration of the light, it will increase the intensity of the light reflected from the first surface.
Of the total school population, 0.9 per cent were mental defectives. The undue number of one-room rural schools in the county which were of faulty construction, with poor equipment, and with imperfect teaching facilities, were largely responsible for the retardation found in the county.
This grievance had naturally gathered emphasis as the years advanced, and Lady Mallinger, after having had three daughters in quick succession, had remained for eight years till now that she was over forty without producing so much as another girl; while Sir Hugo, almost twenty years older, was at a time of life when, notwithstanding the fashionable retardation of most things from dinners to marriages, a man's hopefulness is apt to show signs of wear, until restored by second childhood.
It is easy to see that this retardation of the one end of the wave must cause it to swing round and change its front, so that when the wave has fully entered the glass its course is oblique to its original direction. According to the undulatory theory, light is thus refracted. With these considerations to guide us, let us follow the course of a beam of monochromatic light through our glass prism.
The result had been approximately identical, and Hooker had satisfied himself that somewhere in the centre of Labrador his fellow-scientist the discoverer of the Lavender Ray was conducting the operations that had resulted in the dislocation of the earth's axis and retardation of its motion.
They would have surely concluded that their present velocity would never be able to take them as far as the neutral point, not to talk of passing it. The reason of such considerable retardation was, that by this time the Projectile had reached such a great distance from the Earth that it had hardly any weight.
Give each of them a velocity of rotation of about one revolution in a second; the one lubricated with oil will come to rest before the other begins to give evidence of any sensible retardation; but if at any moment the stop-cock which supplies the water to the second be turned, this one will also stop, and its stopping will be instantaneous.
Unless the calculator was prepared to be instantly overwhelmed by physical force and mental complexity, he must stop there. Thus, taking the year 1900 as the starting point for carrying back the series, nothing was easier than to assume a ten-year period of retardation as far back as 1820, but beyond that point the statistician failed, and only the mathematician could help.
There could therefore be no hesitation in assigning the whole of the retardation of motion to the influence of the obstacles; and since, after subducting this retardation from the total phenomenon, the remainder was a uniform velocity, the result was the proposition known as the first law of motion.
This suggestion also meets with the entire approval of Sir W. Thomson, who shows that meteor-dust, accumulating at the rate of one foot in 4,000 years, would account for the remainder of retardation.
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