This is a most versatile instrument used in non-precision measurements. It is generally used
with surface plate for layout work and inspection. It consists of a rigid base whose bottom surface
is made perfectly flat. A spindle
carrying a scriber in a universal
clamp is attached to the base. The
spindle can be inclined to the base in
any position and clamped in place by
tightening the spindle nut. After
tightening it, slight inclination can be
further given for finer adjustments by
an adjusting screw. Actually the turn-
ing of the adjusting screw moves the
whole spindle assembly up or down
thereby tilting it very slightly. The
scriber can be slid up or down the
spindle and at the same time tipped
back or forth in any position. The
scriber can thus be set at any position
desired. The base of the universal sur-
face gauge is generally grooved so
that it may be used on cylindrical