頭部計測用写眞裝置竝に距離偏歪修正器

概要

論文の詳細を見る
In stead of the direct measurement of human head hitherto commonly used with some inconvenience, the author devised an apparatus for measuring photographycally the head within an error of 0, 5mm. A pair of reflecting mirror and a pair of prism positioned properly before the camera permit to photograph the head of seated individual simultaneously from both frontal and lateral side on one same 35mm. film. The eye-ear-plane of the subject must be kept horizontal meanwhile and a pair of scale are fixed near the head. The deviations of lengths resulted from the difference in plane between the scale and the object to be measured are known from the two-sided portraits to make necessary corrections by calculation. The deviation corrector makes it possible to eliminate the trouble of calculation and the actual lengths are readily legible on its scale. The largest error found for the full length of picture was 0, 9mm, in ordinary range of head measurement, however, it was 0, 5mm.
九州歯科学会の論文
1954-08-30