448 BEAN. 



1 meter long and 12. S centimeters wide, on wliich a sliding brass piece 

 supports the pantograph with the measuring arm. A smooth board on 

 which drawing paper is held by thumb tacks is clamped to the end of 

 the horizontal bar. The aluminum frame has a horizontal aluminum rod 

 inserted at its middle, through the end of which another rod passes 

 verticall}' to carry the head rest. At the upper end the vertical rod works 

 in a cylindrical joint which allows rotation through 360 degrees, and at 

 the lower end is a ratchet attachment by which the head rest may main- 

 tain the head at any desired angle in the vertical plane. Four supports, 

 only two of which are shown in Plate I, serve to fix the head so that it 

 remains rigid while the outlines are being made. 



A unique feature of the cephalograph is the measuring arm of the 

 pantograph (Plate II), which has a semicircular brass bar with a radius 

 of 25 centimeters interposed between its extremity and the adjacent joint 

 in such a manner that the parts of the arm contiguous to the semi- 

 circular bar may glide from one end to the other of the bar, or may be 

 fixed at any point, the end of the measuring arm remaining at the same 

 point regardless of the jDosition of the other parts of the arm. 



On the end of the measuring arm is attached a small frame holding 

 a wheel so that a rolling surface comes into contact at all times with 

 the part being measured. The weight of the measuring arm and the 

 rolling contact allow exactly the same pressure to be exerted continually 

 without any appreciable effort on the part of the operator of the 

 cephalograph. 



Coronal, sagittal and horizontal outlines of the head and face may be 

 made easily and rapidlj', and outlines in almost any direction arc possible 

 with a little nianoeuvering. With the position shown in Plate I, only 

 vertical longitudinal outlines can be made, but by rotating the head rest 

 through an angle of 45° horizontally, coronal outlines are possible; then, 

 by depressing the head rest until the face is prone and the horizontal posi- 

 tion of the head assimies the vertical direction, horizontal outlines can 

 be made. 



The weight of the machine packed in a portable case is about the 

 average load for a native carrier, about 30 kilos (75 pounds.) 



It is to be hoped that the cephalograph, will be used in scliools and 

 imiversities, as well as among the wild tribes and native pcofiles of the 

 earth that are little Icnown, and wherever the living may be measured. 

 The cephalograph can also be used for measuring any solid body to which 

 the attachment at the head of the measuring arm can be applied. For 

 this reason it may be of service in measuring skulls and other bones as 

 well as any objects of which the contour in any given jilane is wanted, 

 although slight alterations may be necessary if a complete circuit of an 

 object is desired. Criticisms and suggestions will be gladly received, for 

 I realize the imperfections of the instrument, but I believe it represents 

 a distinct advance in the application of mechanics to the reproduction of 

 the outlines of the head and face. 



