The threads in a piece of fabric that run
the length of the fabric.
Determine neutral buoyancy of a
gas balloon or airship by taking weight off at
Wind direction is alwaysexpressed by the direction the wind is coming
A strong and sudden shift in wind
speed or direction, which may be either vertical
or horizontal. Wind shear should not be confused
with normal wind change, which is gentler. Wind
shear is often associated with the passage of a
weather front, or a strong temperature inversion.
A long, tapered cloth tube, open
at both ends, mounted on an elevated pole, and
allowed to pivot. The large end is supported and
held open by a circular ring and points toward