Of the screwdriver, illustrated in Fig. 75, at least two or three sizes will be found necessary.
Fig. 75. Ordinary Screwdriver.
The scratch awl, Fig. 76 - although but little employed at the work bench, where a knife is used in its place for all accurate markings - is indispensable to the pattern maker for laying out the dimensions on his work while it is revolving in the turning lathe. It should be long and slender, as shown, and is used on the revolving wood by placing it over the required graduation of the rule, while the latter is held on the tool rest.
Fig. 76. Scratch Awl.
Brads and small wire nails must often be driven at such an angle to the grain of the wood, or in such a position, as to make it necessary first to bore a small hole in order to start the brad in the required direction. The brad awl, illustrated in Fig. 77, is a convenient tool for this purpose. It is commonly ground to a chisel point, as shown at a, but will be less liable to cause splitting, and will work faster and with greater ease, if ground to a double spear point, as shown at b. The four corners, if kept sharp, will enter the wood and cut faster than the chisel point.
Fig. 77. Brad Awl.