Perhaps L. D. Porta's best known contribution to the development of the steam locomotive has been his development of the Lempor exhaust system.

To read his paper "THEORY OF THE LEMPOR EJECTOR AS APPLIED TO PRODUCE DRAUGHT IN STEAM LOCOMOTIVES", in Adobe Acrobat format, click here. (197Kb)

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"The Lempor ejector resembles the Le Maître and is thermodynamically equivalent to the Kylpor, the latter resembling the Kylchap. However, its internal losses to friction in the mixing device are smaller." L.D.Porta