Device for measuring a head size has two legs with concave inner sides, swivel joint at one end, markings on at least one leg at other end at different distances from joint to indicate different head sizes

摘要

The device has two legs (2,3) with concavely curved inner sides (4,5), a swivel joint (10,11,17) between them at one end (6,7), of which at least one leg has markings (14.1-14.4) at the other end (9) at different distances from the swivel joint to indicate different head sizes and towards which the other leg can be swiveled with its other end (8).