Little need be said about these tools, as their use and general shape are well known. There are several patented forms, but apparently they are principally used by amateurs, as they are rarely seen in practical shops. In quite inexperienced hands they may have some occasional advantages over the common kind, one of which is shown in Fig. 28, but with a very small amount of practice these are quite satisfactory. In one of the best and most practical patent screwdrivers the screw head is held to the edge of the blade, and so might seem to supply a want. It is, however, seldom seen in the hands of practical artisans, and the ordinary form holds its own.
Fig. 28. - Ordinary Screwdriver.