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  1. Do you mean caustic soda which is sodium hydroxide or do you mean washing soda which is sodium carbonate? Sodium hydroxide reacts with metals such as aluminium, zinc, tin and lead (and copper when hot) producing hydrogen. It also corrodes skin and turns the skin oils into soap. Regards Roger
  2. It looks to be in photographic grey so I wonder if it ever went into service looking like that. If it was just a works photograph why have they used it as a billboard even for GNR posters? Regards Roger
  3. What do you use for chemical blackening and do you have any tips on how to use whatever it is? Regards Roger
  4. Hi Tom, Can you tell me what size the bricks are and hat the item number is for Flemish bond? Regards Roger
  5. The Great Eastern where using 30ft rails with 11 sleepers per length. In about 1904 the number of sleepers to a rail was increased to 13 because of the heavier Clauds coming into service. There is a thread on templot which gives much more information. http://www:85a.co.uk/forum/view_topic.php?id=965&forum_id=1 Regards Roger
  6. Would it be possible to design and store a bell crank to use with the under baseboard tie-bar (item 1-100). Ideally it would need a firm pivot which could be screwed down and be adjustable and able to reduce the from 10mm or more to approx 1.5mm. I think the materials used for the tie-bar (1-100) might be ideal but I have no experience of this sort of design. Regards Roger
  7. Thanks Jerry ~ just what I wanted to know! I wonder if Edward Sissling stocks them. Roger
  8. How does the "bench plate" fix to the bench? Does it need to have a recess cut in the bench or is it a clamp on device. I need one to fix to the kitchen table without upsetting anyone.
  9. You could use a crank with unequal arms. Mount the magnet on the long arm and drive the shorter arm. Alternately a lever pivoted at one end, the magnet at the other and driven say 25% of the distance from pivot to magnet. This would increase the movement fourfold but with a loss of force to move the magnet. Roger
  10. Thanks for the offer Don but I have a lifetime supply of new lead offcuts from some roof repairs. However I asked about copper tungsten as I am struggling to add enough weight. Regards Roger
  11. Thank you for the suggestion. Unfortunately the product they sell is some form of cloth presumably loaded with tungsten powder. I measured the density and it was about 5.3 gm/cc about half that of lead and about 3/8ths of pure tungsten. Regards Roger
  12. Does anyone know of a supplier or other source of copper tungsten sheet for adding wieght to a loco? Roger
  13. Sorry for the delayed reply as I have not viewed this thread for a while. I have tried to draw a view of the tool which I agree is not easy to show so I have added cross sections of a normal cutter and of the skrawker. I ground off the end of an old cutter at an angle and then made the cut curved so that the end was nearer to vertical. I thought that if the end was at an angle it would tend to push the tool out of the work piece. The cut is made by the flat face which gouges out the plastic and does not try to cut through it. ​Note that the skrawker mentioned in post #1823 is a hand held tool, however my tool is made to work in the same way. ​Regards Roger
  14. This could be because the bolt holes in the sleepers have worn and the PW gang have moved the sleeper and re-drilled the holes. This might happen more often on lesser and out of the way lines which did not attract the maintenance expenditure levels afforded to main lines. Regards Roger
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