Fig. 200 shows a more complicated form of latch with a trigger protruding
from the lower part of the door, which is hinged to a wooden shaft, and
the shaft in turn is connected with the latch. The fastenings of the
trigger to the shaft and the shaft to the latch are made with hardwood
pegs or wire nails which move freely in their sockets. The latch is the
simplest form of a wooden bar fastened at one end with a screw or nail on
which it can move up and down freely; the other end is allowed to drop
into the catch. The latch itself is similar to the one shown in Figs. 193
and 194. The trigger is also fastened to a block on the outside of the
door by a nail or peg upon which it moves freely, so that when the weight
of the foot is placed upon the trigger outside the door that end is forced
down which pushed the end attached to the shaft up; this pushes the shaft
up and the shaft pushes _the latch up_; thus the door is unfastened. The
diagram to the left in Fig. 200 shows the edge of the door with the
trigger on the outside, the shaft upon the inside. The diagram to the
right in Fig. 200 shows the inside of the door, the end of the trigger,
the shaft, the latch, and the catch.