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"As a general average of these four crops the annual value of produce from one acre has decreased from $11.05 to $8.18. Here we have information which is almost if not quite equal in value to that from the Agdell rotation field at Rothamsted.
But in the case of the system consisting of the sun and Jupiter the circumstances are quite different Jupiter does not always bend the same face to the sun; so far, indeed, is this from being true, that Jupiter is eminently remarkable for the rapidity of his rotation, and for the incessantly varying aspect in which he would be seen from the sun.
If in the one case the springs are made more and more stiff, and in the other case the angular velocities of the fly wheels are made greater and greater, the periods of the vibrational constituents of the motion will become shorter and shorter, and the amplitudes smaller and smaller, and the motions will approach more and more nearly those of two perfectly rigid groups of material points moving through space and rotating according to the well known mode of rotation of a rigid body having unequal moments of inertia about its three principal axes.
In the one order the rotation of a wheel produces electricity, and in the opposite order electricity produces the rotation of a wheel. Or to exhibit the same principle in the simplest arithmetical form, if 10÷2=5 then 10÷5=2.
Indeed, by way of perpetually commemorating the joyful event, clubs in which the members entertained each other in rotation were instituted among the higher classes, and seem to have materially stimulated the rising tendency to the formation of cliques. Worship of Bacchus The effect was only too rapidly and fearfully apparent.
The little demand for butcher meat, or the produce of pasture, is probably, as Arthur Young has hinted, one great cause of the continuance of the fallow system of husbandry in France; for where there is no consumption of these articles, it is impossible that a proper rotation of crops can be introduced.
But the markings on the surface, from which the time of rotation has been determined, and which indicate a resemblance to the surface of our own planet, can be well seen with telescopes of six inches aperture and upward. One or both of the bright polar spots, which are supposed to be due to deposits of snow, can be seen with smaller telescopes when the situation of the planet is favorable.
I had never known that agriculture had so many subdivisions, that soils could be analyzed and treated, that rotation of crops enriched the soil, that a certain crop planted season after season on the same soil made it poor, because it was ridding it of some life-giving chemical. To me soils simply "wore out."
To counteract this resistance and to render the beam sensitive to a very slight excess of load at either end, a poise, D, is attached to the beam by a standard, C, which poise carries the center of gravity of the structure above the axis of rotation. This high center of gravity tends to make the beam "top heavy," or in unstable equilibrium.
Turning the prism in front, these colours gradually fade and disappear, but, by continuing the rotation until the vibrating sections of the prisms are parallel to each other, vivid colours again arise, but these colours are complementary to the former ones. Some patches of the splinter appear of one colour, some of another. These differences are due to the different thicknesses of the film.
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