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 | | This result seemed to have escaped notice; the tests of Zeuner have always been listed as insignificant because he used very small sized orifices, 10 and 14,14 mm, unrealistic backpressures and very wide chimneys. |
 | | Please note that the Zeuner relation between both masses and the areas means that the smaller, better performing, orifice needs a larger chimney area, not a modelled one. |
 | | All these three historical researches used steam with constant pressure in their models and regardless of differences in the model layout arrived at the same conclusion: A half area orifice can create a vacuum of at least 70% of that of the original orifice. |
| www.trainweb.org /tusp/koopmans/multiart.doc (6766 words) |
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