GV—86 PHOTOGRAMMETRIC ENGINEERING
around the subject's head. The shield is a thin metal strip located between light
and subject. The lamps are so adjusted that their filaments are in the same plane
as that going through the edge of the opaque shield. With this arrangment the
lamps throw a sharp shadow edge of the shield against the head and neck of
the subject. The schematic diagram in Figure 2 shows a top view of a recording
device for an all-around sculptured portrait.
'The shadow edge divides the head and neck in two parts, a dark one and the
Fıc. 1. Recording device for all-around portrait.
other illuminated. The dividing line follows the configuration of the head and
neck, thus revealing their outlines. The revealed contour outlines are photo-
graphed by the motion picture camera.
The camera with lights and shield together form a unit. When moved
through a small angle around the subject, the dividing line is also moved
through a small angle, thereby revealing another contour outline of an adja-
cent but slightly different section through the head and neck, which the motion
picture camera, actuated by the rotation of the unit, photographs. These