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bartley

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  1. bartley

    Wooden yard question

    I think the person who used a slot through the yard to house the cleats was Jesselee. Regards, John
  2. Michael, None of us are in Doris' league. However, in my limited foray into this art I have discovered that there is quite a difference in flexibility of the baked clay depending on the brand. The brands available in the west are Fimo, Premo and Sculpey For thin strips Fimo and Premo remain quite flexible but Sculpey III is very brittle John
  3. bartley

    Lowering Yards

    I know that when square-rigged ships were in port, or when sails were furled, the upper yards were lowered by 2 to 3 m. But why did they do this? Was it to decrease windage or was there some other reason? John
  4. OK Carl, Dual Pixel. I understand that one of the most important things about these is the accuracy of focussing by what they call phase detection. All to complex for me I am afraid! But you are right about the need to minimise the amount of software manipuletion. John
  5. I am not 100% sure but I think these files are actually "double precision". ie more digits for each pixel (and so more bits and a larger file) John
  6. Jim, Here in Oz I by ZAP CA. There are four grades which vary in viscosity: Pink is Super thin and dries in 1-5 sec Green is Medium and dries in 7- 10 sec Yellow or SLO-ZAP dries in 30 sec There is also a purple bottle called Safe ZAP which is supposed to be "fumeless" and is medium viscosity. I have not tried this one. The viscosity obviously affects the drying time but it also influences the gap filling ability. John
  7. I wonder if members are aware of this amazing find: On 27 March this year the 48-foot hull of an 18th century shipwreck washed ashore on Ponte Vedra Beach in Florida The ship is surprisingly well preserved with wooden pegs and copper-covered tacks still intact and roman numerals etchings still visible on the wooden beams Researchers are not sure what kind of ship the hull might have come from John
  8. Druxey The term “coating” may need to be treated with some licence, especially in the language of 200 years ago. In the book on Marine Antifouling from Woods Hole the statement is made “In the 18th century, wooden sheathing was filled with copper nails whose heads touched each other.” The article does not, however, say that this was called “Pease”. You are correct, Druxey, when you say that the typical green colour, which we see on copper rooves only forms in air. It is probably mainly copper carbonate but the chemistry of the oxidation of copper is complex. Copper oxide is certainly brown but copper chloride which forms in sea-water is bluish geren when in its hydrated form. Anyway, perhaps the more interesting fact is that although this treatment would possibly have prevented the attachment of barnacles and the build up of algal slime, it would not have prevented the ingress of Toredo worms which would attack the wood between the nails. In fact, first copper plating suffered from a similar deficiency since the worms were able to penetrate the gaps between the plates. Later a layer of canvas or felt was attached to the hull before the plates were attached so that there was no bare wood for the worms to attack. In fact, I have seen these worms “in the flesh” as it were. In a previous life I belonged to the Brisbane 18 Footers Sailing Club located on the Brisbane River. In the early 1980’s we refurbished our wharf involving, among other things, removing the 80 year-old wooden piles and replacing them with concrete ones. In spite of the original piles being made of Australian hard-wood, the section below the low tide mark was riddled with holes made by Toredo worms. We could not at first see the worms themselves but when the piles were cut in half the worms were visible and could be prised from their tunnels. The largest were about half an inch in diameter. They had a domed carapaceous head and jaws but the intestines and other body parts had no covering of any kind. I can only describe this part of the animal as resembling a piece of snot. The largest were about a foot long. The tunnels were parallel to the grain and seem to be lined with some kind of calcified material, perhaps to prevent them from collapsing. These worms apparently never emerge once they have invaded the timber and spend their whole lives in the sane piece of wood. How boy Toredo worm meets girl Toredo worm I am not sure but adversity has never been a deterrent for this kind of activity. Incidentally, for those who have never seen an 18 foot sailing boat, it is worth having a look on the web. They are an unrestricted class of sailing boat and there are only two rules – The boat must be 18 feet long and the race starts at two o’clock. There have been many developments over the years but they are always grossly over-canvased and capsize at the slightest provocation. John
  9. Druxey, This topic is old now but I read somewhere (not sure where now) that "pease" was a fore-runner to copper plating and was indeed round headed copper nails put into the hull at intervals below the water line. These of course turned green in salt water and were referred to by sailors as "pease" which is the Old Enlgish spelling for the plural of "pea" John
  10. For what its worth, Rod. The way I do this is to put diluted PVA on the rope loop just before I tighten it onto the block. This means that the INSIDE of the seizing is soaked in glue. I have never found that the cut off end pulls through. John
  11. Does anybody know if this Company is still in business? I ordered a book from them on 26th January and it has not arrived. My six emails on the subject have remained unanswered. Are they a normally reliable? are they even syill trading? John
  12. SeaWatch Books - Unreliable?

     

    I ordered a book from this Company on 25 January.  I have never received it an my six emails about this issue remain unanswered.  Does this company still exist?

     

    John

  13. bartley

    CA glues

    You might also consider using a non acidic PVA (white glue). Products like Weldbond are quite acidic. The downside is that the non acidic variety takes longer to dry and I dilute only by about 30 % John
  14. Mike, I just noticed your post about the slings. On my plans for Royal Caroline The cross trees actually protrude about 0,5 mm above the support beams so that there is a 0.5mm gap between the top and the cross trees assembly (enough for ropes to pass through). Of course I did not notice this subtlety and so I have the same issue as you. Regards, John
  15. Ken, On the camera issue - I had this problem with a Canon SLR a few years ago and unfortunately it turned out to be the computer in the camera. Expensive! Sorry to be depressing. Yes, I have used that method for coils myself. I got the idea from Shipbuilding for Dummies and ir works well. Your build is looking good. John

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