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Mascheroni construction: Construct the midpoint of a line segment.

Mascheroni or Mohr-Mascheroni Construction A geometric construction done with a movable compass alone, named after the Italian geometer Lorenzo Mascheroni (1750-1800), who, in his Geometria del compasso (1797), astonished the mathematical world by showing how every compass-and-straightedge construction can be done just using a compass without a ruler.

Straight line: it's assumed that two points, obtained by arc intersections, define a straight line.

Georg Mohr (1640-1697) proved the same results earlier in his Euclides danicus (1672).

Mascheroni, or Mohr-Mascheroni, constructions are today primarily of interest to puzzle enthusiasts who try to improve on the older solutions by finding ones with fewer steps.
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