This thesis is a study of the boundary
layer on a flat plate, using a new method of
observation. The boundary layer, and in particular,
the laminar region, has been examined
using a new device, which takes the form of a
small vane. This vane is freely hinged and
suspended at its leading edge, lies vertically
in the xz plane, and its dimensions are of
the same order as the wavelengths of the disturbances,
to which it is expected to respond.
Such an instrument responds only to v
fluctuations of velocity and is uninfluenced
by those of u and w.
The ultimate aim of the research programme
is to use the vane in the transition and turbulent
regions, and attempt to obtain information
on the formation of turbulence. Before
the vane can be put in the turbulent region,
however, its own performance has to be
ascertained, by investigating relatively
well known phenomena in the laminar region,
and this forms the subject of the thesis.