One of the simplest of the foot latches consists of a piece of wood cut out by the aid of axe and hunting-knife to the form shown by Fig. 199; a hole in the door cut for that purpose admits the flattened and notched end and upon the inside it fits the round log sill. The owner of the shack, when reaching home, steps upon the foot latch (Fig. 199), which lifts up the catch (on the inside) and allows the door to swing open.
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.
In the preceding locks and fastenings, no matter how generous and hospitable the owner may be, his latch-string never "hangs on the outside," but in this one the latch-string literally hangs outside and any one may enter by pulling it (Figs. 193 and 194). But when the owner is in and does not want to be interrupted he pulls the string in, which tells the outsider that he must knock before he can be admitted. This simplest form of latch has been here put upon the simplest form of a door, a door with a wooden hinge made by nailing a round rod to the edge of the door and allowing the ends of the rod to project above and below the door. In the sill log below the door a hole about two inches deep is bored to receive the short end of the hinge rod; above a deeper hole is bored to receive the long end of the hinge rod. To hang the door run the long end up in the top hole far enough to lift the door sufficiently to be able to drop the lower end of the hinge rod in the lower hole. Your door is then hung and may swing back and forth at your pleasure. Notwithstanding the fact that such a door admits plenty of cold air, it is a very popular door for camps and is even used for log houses.