POCKET-KNIFE.--Here is an excellent thing in pocket-knives.
Attached to the handle is a revolving plate which, when the knife is
opened, turns round and catches the blade firmly, making it impossible
for it to close and holding it absolutely rigid.
So many accidents have occurred through the slipping of the pocket-knife
that it seems strange such a simple device as this should not have been
thought of before.
[Illustration: Pocket-knife]
We are aware that there have been several knives made with springs to
hold the blade firmly when open, but these have all been large and
clumsy knives, whereas the one illustrated is really what it pretends to
be--a pocket-knife.