Back to the Trevithick Dredger Engine

The 6″ vertical boiler is virtually completed.  Well, actually, I still have to make a Duplex steam pump, fit a steam injector, make a steam delivery manifold, paint some bits….  but yeah, emotionally, for me it is finished.   I will get back to those bits as the mood takes me.

So I have picked up the bits of the Trevithick steam dredger engine.  I will concentrate on the boiler, so I can get the AMBSC certification, then take a leisurely approach to the engine.  You know, 2 weeks to the boiler certification then another 4 weeks to finish the engine.  Or something like that.

 

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As you can see, I have redesigned the inspection hatch, and made the new version.  This is still not quite authentic, but it is much closer to the London Science Museum example.  The inspection hatch will be permanently closed, silver soldered shut.   And the wording reflects the fact that this is a model.  The model hatch is circular, whereas the LSE example is something between a circle and an ellipse.   Trouble is that we do not know what is original Trevithick and what was altered in 1870.   So I do not feel too guilty that I am guessing.

 

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Sorry about the poor focus.  I will retake this shot later.  You can read my new AMBSC ID number.  I do feel presumptuous writing my name the same size as Trevithick.

 

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I have marked the boiler perforations and will drill the holes then make the bronze bushes.

 

B002617 hi res

A hi res photo of the dredger engine in the LSM.  You can see that the inspection hatch is something between a circle and an ellipse, not a rectangle. And that firedoor hinge is definitely sus.