The rachiometer consists of a rigid vertical metal rod one inch in square dimensions. It is mounted on a base which supports a set of foot plates so placed that a patient can stand in front of the rod.[…]At one inch intervals running anteroposteriorly through sleeves within the vertical stand rod, are pencil like metal pegs that readily slide back and forth. After the patient is placed in position in front of the vertical square rod, these pegs are progressively brought, from above down, in contact with the patient's back. The patient then steps away from the rachiometer and it will be noted that the placed anterior tips of the pegs describes the spinal curves.