. Anthropology . ndylean, or true horizontal plane of theskull, whose measuring points are out of reach, but to the plane ofCamper, that is to say to the line passing over the auditory meatusand the base of the nares, which is the only convenient one, theone most easy to determine on the living subject. With the tableat page 267, which gives the inclination of this plane in relation tothe alveolo-condylean, it will always be possible to convert theprojections, and even the angles relating to them, into equivalentmeasurements on the skull. 328 METHOD OF PEOCEEDING. [Chap. 7 The general method o
. Anthropology . ndylean, or true horizontal plane of theskull, whose measuring points are out of reach, but to the plane ofCamper, that is to say to the line passing over the auditory meatusand the base of the nares, which is the only convenient one, theone most easy to determine on the living subject. With the tableat page 267, which gives the inclination of this plane in relation tothe alveolo-condylean, it will always be possible to convert theprojections, and even the angles relating to them, into equivalentmeasurements on the skull. 328 METHOD OF PEOCEEDING. [Chap. 7 The general method of proceeding is shown in Fig. 39. Theindividual is in an upright position against a wall, upon whicha measuring-tape or a graduated rule is applied, whose zero is onthe ground. The head looks straight forward, so that thehorizontal line of Camper, passing across the auditory meatus andthe base of the nares, is exactly perpendicular to the wall. A largesliding-square is moved up or down until the various measuring. Fig. 39.—Position for taking projections of the head on the living subject. The linepassing across the auditory meatus and the base of the nares, or Campers line,represented by the upper border of the square, is exactly horizontal; that is to sayperpendicular to the posterior plane. A D, Projection of the entire head ; B D=HD,The projection of the entire cranium ; C D, Projection of the posterior cranium; C H,Projection of the anterior cranium; AH, Projection of the nasal and supra-nasalportions of the face. points, such as the top of the head, auditory meatus, &c, arereached; a second, smaller one, at right angles, is applied upon it atthe measuring points which are otherwise inaccessible, as the supra-orbital, the alveolar, the mental points, &c. The heights above theground are read off on the wall; and on the sliding-square, which isgraduated, the horizontal distances in front of the posterior plane,these distances being directly visible, or indicated by the heel
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