I enjoy reading all the comments but apologize that
there are so many I can’t answer individually. I’m delighted that my
new videos have been so enthusiastically received, which is reflected in
the majority of the comments. The videos aren’t perfect though so below
each video I’ve compiled the comments about things I omitted or people
thought were misleading. A few comments added wonderful additional
information so I’ve included them as well.
I’m embarrassed that I said video projector colours are Yellow, Cyan and
Magenta after misunderstanding the Wikipedia entry. Video images are all
based on Red Green Blue. It is a bit confusing because projectors with the
Texas Instruments tilting mirror chips use several different systems and
some have a spinning colour wheel of dichroic CMYK glass mirrors. I now
guess this acts as a filter for the white source, allowing through the
complementary RGB colours.
Peter Van Ginneken wrote that the Rotterdam flood barrier
does not have any wheels of rollers along its length. Instead it has
buoyancy tanks so it literally floats out into position. The tanks are
then flooded, lowering the gates to the bottom and forming a watertight
seal. So ingenious as he says.
Gimp pins are still used for upholstery and remain easily
available.
Several people were appalled that I used a claw hammer on
the chisel to rebate the door hinge. A mallet is better because the wider
head makes it harder to miss so its easier to your eye on the work. But my
hammer just feels like an extension of my arm, its something I just use
without thinking.
Other people worried about having my fingers so close when I was
welding. The video makes it look more alarming than it is is reality. I’ve
done tack welds like this for 40 years without getting a bad burn. Picking
up hot parts up forgetting I’ve just welded them is more of a problem, I
am now literally very thick skinned.
Tufnol is known as Garolite or 'Canvas Phenolic' in the US.
