Today’s teaser, what is it ? what is it for

Is it some kind of sine calculator, or some other compound angle plotter or calculator? Where do you get all this weird stuff! :-)

    Pantograph device for scaling drawings?

    Lelit Elizabeth, Niche Zero

    V60 with Drip Assist, Clever Dripper, Knock Feld47

    Aeropress, Knock Aergrind

    I have never seen anything like it….do you actually have any ordinary tools in your workshop?

      DavecUK Yes of course I do,mostly mundane ones but also a few odd / unusual ones🤣

      Gagaryn Not quite as flamboyant/ usually a boiler suit but quite a variety of ‘stuff in the garage’

      1. I think this run long enough

      The tool is an automatic roofing square, giving all the cuts and lengths per Ft / run traditional roofs.

      The cuts (bevels) although 45 deg in plan need to be worked out geometrically to find the actual angle to mark on the timber.

      Below shows the face of the square and it’s slightly more modern version IF you know ho to use it.

      a month later

      Here’s another one, it’s not a tool though.

      I’m pretty sure that I have a box of them in the garage, with the tool needed to deploy. I won’t say what I think it is to let other people guess