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
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