NavList:

I think we have all had the experience, when using an artificial horizon, that just as you are ready to
take the reading a puff of wind ripples the surface. I finally got around to making an enclosure to
prevent this. I purchased two 5 by 7 inch pieces of glass, sold to replace broken glass in picture
frames at a craft shop, four dollars each. (The also come in larger sizes.) I taped one edge of the
glass together with clear packing tape. I used a piece of the cardboard packaging to make a base by
using blue masking tape to tape the bases of the glass to this cardboard, creating an equilateral
triangle. I then used other pieces of the packaging, cut into triangles, to make the sides, one attached
all around with tape and the other attached only to the base piece so that it can be opened to insert
the small bowl of liquid, I use mercury. This side is held closed with a small piece of tape. I cut a
circular opening in a piece of cardboard to place over the bowl of mercury to act as a stop to prevent
seeing the edges of the liquid where the horizontal surface is distorted by a meniscus. I have
attached several photos of this, one showing the moon’s reflection peeking around my chimney.

gl
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