Abstract
In order to study the serious errors involved in the measurement of the viscosity of liquids by Engler or Redwood or Saybolt viscosimeter, fundamental experiments were carried out on the flows of liquids through some short tubes of different lengths, diameters and entrance shapes, under various conditions. From the results obtained, it is shown that the effects of the surface tension acting on the liquid surface at exit end of the tube and of the turbulence due to the entrance edge of it, perpendicular to its axis, cause the serious errors in the viscosity determination. To eliminate these errors, a new viscosimeter was designed. It consists essentially of a short tube whose entrance end is definitely well-rounded and exit end is immersed in the liquid the viscosity of which is to be measured in another vessel. It is evident by many tests that it is, by simple processes, not only capable of securing higher degree of accuracy than with other instruments above mentioned, but capable of measuring viscosity of any liquid without previous calibration.
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