A
detailed view of the flat lying Tri-Scribe trammel head compass mounted
on a standard steel rule. The centre Tri-Scribe uses its scribe point
as the pivot, whilst the outer Tri-Scribe here uses a normal pencil held
via the small brass pinch bolt on the neck of the unit.
Again, note the forward slant of the unit caused by the base plate chamfer
which transfers load directly onto the marking point tip for optimum performance
whilst still providing a flat laying stability directly onto the workpiece.
In essence the Tri-Scribe unit is using simple physics to ensure superior
performance. By distributing the load as described the flat lying compass
is both inherently stable whilst still maintaining pressure contact on
the marking point.
In real terms this means the woodworker's lay out and marking will be
more accurate and less prone to error. The problem of slip and tilt with
traditional trammel head compasses aligned on a vertical plane is not
apparent. The flat lying Tri-Scribe compass will neither tilt nor slant
inadvertently, and its stability and precision means your starting and
end points will be marked out as desired, rather than at the whim of gravity
or at the reliance of the woodworker's skill and experience.
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