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Updated: May 26, 2025
The forehead was, well, medium-broad and medium high, and quite smooth. No lines nor hints of lines were there, suggestive of nervousness, of blue days of depression and white nights of insomnia. Oh, she bore all the marks of the healthy, human female, who never worried nor was vexed in the spirit of her, and in whose body every process and function was frictionless and automatic.
The tide flowed and ebbed; the sun rose and set; regularly each afternoon the brave west wind came romping in through the Golden Gate, darkening the water, cresting tiny wavelets, making the sailboats fly. Everything ran with frictionless order. Everything was free. Firewood lay about for the taking. No man sold it by the sack.
If there is any motion which is measurable going on in the space, such a brush ought to reveal it. It is, so to speak, a beam of light, frictionless, devoid of inertia. I think that it may find practical applications in telegraphy.
But in 1858 the equations of motion of an incompressible frictionless fluid were first successfully solved by Helmholtz, and among other things he proved that, though vortex-motion could not be originated in such a fluid, yet supposing it once to exist, it would exist to all eternity and could not be diminished by any mechanical action whatever.
Perfect lines and surfaces do not exist within the region of our experience; yet the conclusions of geometry are none the less true ideally, though in any particular concrete instance they are only approximately realized. Just so with the conception of a frictionless fluid.
Scientifically speaking, Helmholtz and Thomson are as well entitled to reason upon the assumption of a perfectly frictionless fluid as geometers in general are entitled to assume perfect lines without breadth and perfect surfaces without thickness.
If we suppose that the air beneath the plane is a solid, and frictionless, and a pair of scales should draw it up the incline, the pull in doing so would be one-half of its weight, or 450 pounds.
Thus Professors Stewart and Tait's inferences as to the destructibility of matter, based on the supposition that the ether is not quite frictionless; Professor Dolbear's suggestions as to the creation of matter through the development of new ether ripples, and the same thinker's speculations as to an upper limit of temperature, based on the mechanical conception of a limit to the possible vibrations of a vortex ring, not to mention other more or less fascinating speculations based on the vortex hypothesis, must be regarded, whatever their intrinsic interest, as insecurely grounded, until such time as new experimental methods shall give them another footing.
The five boys were thoroughly acquainted and on the best of terms. Their work had been reduced to a frictionless routine that left them more leisure than at first. Lane was treasurer and bookkeeper for the concern, and his reports, made every Saturday night, showed that returns, both from the fish and from the lobsters, were running ahead of their estimates at the beginning of the season.
Long as it has lasted, almost universal as it has been, the human being has never yet achieved a perfect adaptation to the needs of the Normal Social Life. He has attained nothing of that frictionless fitting to the needs of association one finds in the bee or the ant.
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