A simple form of spring-latch is shown by Fig. 196, as you may see, _A_ is
a peg driven into the door-jamb. It has a notch in it's outer end so that
_B_, a piece of hickory, may be sprung into the notch; _B_ is fastened to
the door by a couple of screws. By pushing the door the latch will slide
out of the rounded notch and the door opens. When you pull the door to
close it the end of the spring strikes the rounded end of the _A_ peg and,
sliding over it, drops naturally into the slot and holds the door closed.
This form of latch is also a good one for gates.