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Updated: May 9, 2025
One of the researches directly relating to schools is that of the ponogenic co-efficient of the various subjects of instruction, that is to say, of the degrees of fatigue induced by these.
For a time we were led to suspect that the lift of curved surfaces very little exceeded that of planes of the same size, but further investigation and experiment led to the opinion that the anemometer used by us over-recorded the true velocity of the wind by nearly 15 per cent; that the well-known Smeaton co-efficient of.005 V squared for the wind pressure at 90 degrees is probably too great by at least 20 per cent; that Lilienthal's estimate that the pressure on a curved surface having an angle of incidence of 3 degrees equals.545 of the pressure at go degrees is too large, being nearly 50 per cent greater than very recent experiments of our own with a pressure testing-machine indicate; that the superposition of the surfaces somewhat reduced the lift per square foot, as compared with a single surface of equal area.
The resistance due to gravity was 9,814 lbs., and supposing the other resistance to traction to amount to no more than 7 lbs. per tun, the total resistance would be 13,412 lbs., corresponding to a mean effective cylinder pressure of 117 lbs. per square inch, and to a co-efficient of adhesion of almost exactly one third.
The theory of evolution, to speak in simple language, merely asserts, that by chance, in an incalculably long period of time, out of any thing you like, any thing else that you like may develop. This is no answer to the problem. And the same problem is differently expressed: instead of will, chance is offered, and the co-efficient of the eternal is transposed from the power to the time.
The field thus opened to the free activity of the child will enable him to exercise himself and to form himself as a man. It is not movement for its own sake that he will derive from these exercises, but a powerful co-efficient in the complex formation of his personality.
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