The records made with the scoliometer herewith presented eliminate as much as possible the personal equation; by that I mean records may be made by different persons and the chance of error is minimized. The apparatus is heavy, and thus the landmarks obtained at the time of recording are firmly held, and if necessary may be locked by the various thumb screws. The movement of the keyed collars is very accurate, so that the median line of the thorax and pelvis at no time changes its position as regards the anatomical landmarks. The apparatus is not delicate, and aside from obtaining the anatomical landmarks, as for instance the anterior-superior spines and the spinous process of the vertebra, the actual recording is, one might say, almost automatic. The surgeon's time is required only in adjusting the apparatus to the patient, and the actual record-making may be done by an assistant. In the Zander apparatus the contour of the chest only is recorded, and there are no points of comparison. Many of the foreign scoliometers, as for instance, the Zander and Schulthess, are expensive. The scoliometer described in this paper can easily be made in any orthopedic shop.