The ornamental design for a flat compass for marking large arcs, as shown and described.
FIG. 1 is an isometric perspective view of a preferred embodiment shown with a ruler and fat pencil of the flat compass for marking large arcs.
FIG. 2 is an alternate isometric view of a preferred embodiment of the flat compass for marking large arcs.
FIG. 3 is a top view of a preferred embodiment of the flat compass for marking large arcs.
FIG. 4 is a bottom view of a preferred embodiment of the flat compass for marking large arcs.
FIG. 5 is a front view of a preferred embodiment of the flat compass for marking large arcs.
FIG. 6 is a back view of a preferred embodiment of the flat compass for marking large arcs.
FIG. 7 is a right side view of a preferred embodiment of the flat compass for marking large arcs; and,
FIG. 8 is a left side view of a preferred embodiment of the flat compass for marking large arcs.
The broken lines in FIG. 1 represents a ruler and a pencil and are or are not part of the claimed design and are being shown for the convenience of illustration.