ABSTRACT
Anthropometric records, when treated statistically, show the efficiency of the nation as a whole and in its several parts, and the direction in which it is changing, whether for better or worse. They enable us to compare the influences upon bodily development of different occupations, residences, schools and races. To use the instrument the attendant releases the rod by turning a milled head at the top of the instrument; this is carefully arranged to make no sound. The signal sound is given after the rod has fallen a definite distance by a weight which rests on the top of the rod being caught by a diaphragm. The sound is produced by a closed organ pipe, and the pitch is varied by changing its length. An automatic arrangement has been adopted by which the sound is continued during one second, then there is silence during another second, then the sound is reproduced during a third second.
