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In message <[log in to unmask]>, [log in to unmask] writes >I am trying to obtain typical values for the efficiencies of Cornish >pumping and whim engines, both horizontal and beam types. > >Can anyone advise as to where such data can be obtained, and >how to convert such data to SI units? Are there any subtle pitfalls >that should be observed? > >My second query concerns Lean's Engine Reporter. Does anyone >know when it was stopped being produced and exactly what data >did it record? Is there a source of transcripts from this publication? > >Any advice is appreciated! > >Martin Roseveare I expect that5 you have already tries DB Barton The Cornish Beam Engine but I will suggest it anyway. 1969. Reprinted 1989 by Cornwall Books. -- John Phillips [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%