Janet Tweedy wrote:

Why doesn't anyone invent a spirit level that's really a flat square
with the bubble bit in the centre and four radial glassy bits so you can
see each way at once if you balance the flat square on top of things

There are such things- frequently found on a video photographer's tripod,
for instance.
Not terribly accurate, but good enough for the purpose; the bubble is in a
round enclosure. They break if you drop the tripod just right.


Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic
Zone 5/6 in upstate New York, 1420' elevation. NY WO G