모노코드
Sign in to save275px|thumb|A string, tied at A, is kept in tension by W, a suspended weight, and two bridges, B and the movable bridge C, while D is a pulley|freely moving wheel, density may be tested by using different strings
275px|thumb|A string, tied at A, is kept in tension by W, a suspended weight, and two bridges, B and the movable bridge C, while D is a pulley|freely moving wheel, density may be tested by using different strings