9 
in its carrier, C and E, which fits on the rod, A, and can be 
lengthened or shortened in respect to its projection on either 
side of the rod. The sliding arm also slides vertically as well 
as horizontally while the fixed arm slides only horizontally ; 
both arms and their carriers are easily removable from the 
rod, so that either one or both may be used as occasion 
requires. A foot-piece in the form of a shallow box, fig. 2, G, 
in which the arms and their carriers are packed, is supplied 
as part of the apparatus. To this the rod may be fixed in an 
upright position, by inserting it into the bore in the hole I, or 
by attaching a rest, H (also supplied with the instrument), to 
the zero end of the rod, it stands in a vertical position on the 
lid of the box. 
To take the first four essential measurements, place 
the arms on the first segment of the rod with their 
extremities projecting equally on either side of it, PI. I, fig. 1. 
The length and breadth of the head are measured between 
the curved ends of the arms, the dimensions of the nose 
between the straight and pointed ends. To measure the 
projections Nos. 5, 6 , 7 and 8 slide the fixed arm horizon¬ 
tally till its' curved end is prevented going further 
by the carrier, PL II, move the sliding arm horizontally in 
the opposite direction till the point of the straight end is 
only just seen beyond its carrier; adjust the head of 
the subject to the proper position for measurement and 
rest the fixed arm on the vertex, the pointed end directed 
towards the back of the head, while the rod rests against 
the point of the person’s nose ; slide the gliding carrier and 
arm, D E, vertically downwards to opposite the root of the 
nose, and finally slide this arm, D, horizontally forward till 
its pointed end touches the proper spot, 6, PL II, at the root of 
the nose, when the measurement may be read off on the rod. 
The gliding arm is now moved horizontally from the 
face, drawn vertically downwards to opposite the mouth, 
and again projected horizontally towards the face, then 
by careful adjustment with the two movements of the arm 
the measurement from vertex to mouth, d , is obtained. The 
other projections are measured in a similar manner. 
