Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . own theshape taken by such a liquid whenfalling from a circular hole in thebottom of the containing vessel. There is an interesting pointin connection with the shape oroutline of the falling stream whichis at first surprising. It comes outthat, when the flow is slow, thesame shape ought to be assumedby all substances under the same —flow or fulling column -conditions as to size of orifice and height in containing vessel. This ^= j% certainly appeared to be so i
Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . own theshape taken by such a liquid whenfalling from a circular hole in thebottom of the containing vessel. There is an interesting pointin connection with the shape oroutline of the falling stream whichis at first surprising. It comes outthat, when the flow is slow, thesame shape ought to be assumedby all substances under the same —flow or fulling column -conditions as to size of orifice and height in containing vessel. This ^= j% certainly appeared to be so in the jul - jA case of the substances in the series Fig. 8. examined. How this comes about will be understood by considering that if the material is removedslowly below owing to high viscosity, it is fed in at the top equallyslowly. A short length such as marked above draws out as it falls sothat it occupies a greater length at subsequent positions. Nowif we know the rate at which it is drawn out and the force actingupon it, we can calculate the viscosity just as in the direct experi-ments on traction. Vol. XVII. (No. 98.) 2 l. 4-92 Prof. F°. T. Trouton on Viscous Substances. [March 11, In order to know the rate at which the material is being drawnout, two things are required. The amount of material passing downper second—this is easily found—and the slope of the surface to thevertical at the place in question. We can observe this on reflectinga beam of light from the surface of the column so as to pass outhorizontally, by measuring the angle between the incident beam andthe reflected one. So much for the rate of drawing out; now the VIS cosn PY in C. G. S. units. Method SodaGlass 575° SodaGlass 660 SodaGlass 710° Pitch PitchTar X Pitch Tar X Pitch Ta r X Tar m TarBe& v. Benz-ine Torsion II 13 Xl 23 xio 45XI(f lot JO XIO Traction 155 10 XIO BendingBeam 1 09 3 2 x io7 26 xio; Falling Stream 3 6 xio7 37 x io5 .Tube 2 3 xio5 83 xioa 520 24 007 other quantity required, the
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Keywords: ., bookauthorroyalins, bookcentury1800, bookdecade1850, bookyear1851
