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Mechanical Engineering


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About GBH

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  • Birthday 02/10/1936

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    Wallington. London, United Kingdom

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  1. GBH

    What Makes A Ship Move?

    Thank you. Similar arguments apply to the case of a shaft driven by steam (or gas) turbines and a gearbox. One could argue that the vessel is driven by the reaction from the mass of water driven astern by the screw.
  2. The density of gases is insufficient for centrifugal forces to be developed at the rotational speed of a conventional pump. A bladed compressor is similar in principle to an axial pump but designed for gases,
  3. GBH

    Classifications of engine

    Modern vertical marine engines once were called "inverted". That was because screw propellers came after paddle wheels and the cylinders of paddle steamers were below the paddle shaft - or Inclined.
  4. Dear DrD, Thank you for that interesting insight, The competitive ethic of a modern lawyer is utterly opposed to a scientific attitude that makes the truth supreme. It is also contrary the John Rawls's idea of Justice as Fairness. Your account reminds me of the time I invented a mass-balanced relay to resist rotational acceleration (in a guided missile). The drawings were toleranced and I had a batch of a dozen made in the model shop, They were fine, so I had a pre-production batch made. They didn't work. I was mortified, "Back to the drawing board." In my investigation, I went back to the modelmaker. He told me, "Oh, yes." he said, "We had to shave a bit there, to ease them." As a craftsman, he had used his initiative. They had taken off less than a 1/4 mm with fine emery cloth (the model maker's companion tool). As I recall the relay armature was interfering with the bodies, Thr draughtsman had rounded the dimension of the prototype. I had the tolerances amended and even the pre-production batch could be recovered - although that required dis-assembly and re-assembly. In contrast with your case, we were on a cost-plus contract. It works both ways. When the Swift aircraft was discontinued (I was with another company), our management gave instructions that everything, including scrap, that could be found in the factory, should be transferred to the Swift project, to be valued by the Client's auditors, A number of my papers are listed on my sites at http://geoffrey.beresfordhartwell.com/ and at http://www.arbitrator-engineer-gbh.co.uk/papers. It's a hobby-horse of mine. Aye Geoffrey.
  5. A particular range of expert activity is that required for dealing with disputes, whether informally, as expert witness, as court expert, as an adjudicator (FIDIC) or as arbitrator. I wrote a paper about these tasks at http://geoffrey.beresfordhartwell.com/Prato.pdf some time ago. I suppose one could call it my special field of study.
  6. Name: Geoffrey M. Beresford Hartwell Engineering college: Wandsworth Technical College; South Shields Marine Technical College; Croydon College. Location: Wallington, London, United Kingdom Engineering Batch: 1952-1956 Engineering Company: BHA Cromwell House Area of Interest Consulting Engineer; Arbitrator; FIDIC Adjudicator Projects undertaken: Modernisation of TheTower Bridge; Trawsfynydd, Wylfa Head Nuclear Power Stns; Worcester Water Treatment Works Visiting Professor of Arbitration Law, University of South Wales.
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