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bruce d

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  1. Hello Alan, HMS Assurance, 1747. G5896 in Dansk Museum. Very precise drawings of stairs/steps, perhaps good enough to take a scale reading? Here is the link to allow you to get better resolution: - "https://ao.sa.dk/ao/data.ashx?bid=31918097"
  2. Link goes to 'GONE' page EDIT: but I now find it opens on my phone. Ignore earlier moan.
  3. Perhaps I am about to learn something new. You see, I understood that a maxim of wheelmaking, wherever in the world you looked, was the principle of the 'upright' or 'bottom' spoke. The spoke at dead bottom was always meant to be at 90 degrees to the ground when measured from any direction: therein lies the strength of the wheel under load. The 'dish' of the wheel, i.e. the amount of concavity on the outside face, was exactly related to the fixed cant of the axle to maintain this angle. This spoke was thought of as the pillar on which the load rested at any time. Wheelwrights (at least the British, American and French sources I have read) were extremely picky about the wood used for spokes, demanding the straightest grain. After initial shaping if a spoke blank had the slightest imperfection such as a tiny knot or change of colour on the 'sap face' (the back of the spoke which is the convex side of the wheel) it was rejected ('used for ladder rungs' was the dismissive phrase) because of the stresses. Right or wrong, the wheelwrights I have read about all considered straight, correctly profiled spokes to be the only way. Flex within the dished wheel was primarily side-to-side as the horse(s) moved, the jolts from passing over rough surfaces was not what broke/wore out wooden wheels. I could go on, but it really would be interesting to see applications where curved spokes were used if anyone has examples? Remembering where we are, I will think of a way to make it fit in with building model ships later 🤐 .
  4. I am sure you are right. About the wheels, I am not so sure. The angle of the axle, which must match the dish of the wheel, provided all the suspension according to the wheelwrights. The rule was that the bottom spoke was to be perpindicular to the ground in all directions. Of course, if the local rules in Denmark were different, or if the curve served a purpose, I would be interested to know.
  5. Just for the novelty value, here is another 'not-typical' carriage from the same source. After staring a while, I think I understand how the components interchange as described in the text. Note the dish of the wheels is achieved with curved spokes instead of the usual method of mounting the spokes at an angle in the hub: does anybody know if there is a reason for this? Object data wood and brass height 24.4 cm × width 52 cm × depth 35.2 cm Provenance ...; transferred from the Ministerie van Marine (Department of the Navy), The Hague, to the museum, 1883 Object number: NG-MC-780 Copyright: Public domain Entry Item description: Model of a multipurpose carriage for a 4-pounder gun. The barrel is missing, and so is some additional equipment. Assembled in one way as a field carriage, it can be rearranged in another way as a ship carriage. The main body consists of two cheeks connected by a long stool bed and forward by the transom. The quoin has a toothed rail underneath and is moved forward and backward mechanically by means of a worm screw with a crank; it slides in a groove in the bed, from which it cannot be lifted. When used as a field carriage, it moves on two large wheels, which have an axletree going straight through the cheeks. The cheeks are prolonged at the rear with a trail which has a pintle hole and is attached to the forward cheeks with braces. To convert the carriage to a sea carriage, the aft portion of the cheeks, the wheels and the axle are removed, and the remaining body is set on a lower four-wheeled carriage. This carriage consists of two low cheeks, connected by a vertical transom and the axletrees, which are attached to the cheeks with removable braces. The wooden trucks are double and the fore trucks are larger than the hind trucks. Although this type of carriage is recorded in literature,1 its origin is unclear. Jochem Pietersz Asmus (1755-1837) claimed it as his own invention,2 which De Scheel seems to contradict.3 Scale (according to Obreen)4 1:6. Literature: M. de Scheel, Mémoires d’artillerie contenant l’artillerie nouvelle, ou les changements faits dans l’artillerie françoise en 1765 avec l’exposé et l’analyse des objections que ont été faites contre ces changemens, Paris 1795 (2nd ed.), pl. X; J.M. Obreen, Catalogus der verzameling modellen van het Departement van Marine, The Hague 1858, no. 780; H. van Goens, Handleiding tot de kennis van de zee-artillerie, Rotterdam 1861-65, p. 636, pl. XXVIII'
  6. It looks like you are right 👍 according to some very good researchers. See this link for a summary: https://snr.org.uk/snr-forum/topic/hms-victory-figureheads/ Although I can't add anything to ther investigations it now looks like the image I posted represents the first figurehead, not the Trafalgar veteran. It would be useful if the 1891 publisher had given his source, then we could know if the image is a copy of a copy of a ....
  7. Were those the machines used in South Africa? IIRC they were local conversions with boilerplate for armour. You may as well have boiled yourself in oil.
  8. It seems likely that the museum exhibit and model are the same design, certainly the description credits them both to Kinsbergen. Thanks, nice find.
  9. Tom, I'll follow along if there is room, looking forward to seeing this. There is a small stash of pear gathering dust on a shelf in my shop, I wonder if this would be good for me as well?
  10. News flash: the Chinese invented the wheelbarrow as an aide to supplying troops in battle. Yup, I found this ... https://thegardenstrust.blog/2015/02/28/the-wheelbarrow-a-weapon-of-war/ ... which, after describing the events and players behind the original single-wheel cart with trailing handles invented to get supplies delivered over difficult ground, goes on to say ... "Later Chinese military strategists used wheelbarrows as a rapidly assembled and highly manoeuvrable ‘mobile fort’, deploying them around in a circle as a barricade. They were also developed into attack vehicles, with weaponry mounted on them." Here is a picture of a Ming Dynasty wheelbarrow-weapon-thingie - Yet another 'oh good grief' discovery.
  11. Many thanks for the personal story. You may already know it, but this site ... RAFCommands – The meeting place for RAF researchers ... is the best for RAF historical records. There are some very helpful people there. (kinda like MSW in that way... 😇) There is a forum. HTH Bruce
  12. From John Le Carre’ ‘ … I get angry with myself. I tear up a lot of stuff but I always accept that taking the wrong route is very instructive. It gets you to the right one.’
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