Fig-. ISl. Iron Miter-Box. WOOD HAND TOOLS. 105 screwdriver is rarely exactly in line with the axis of the screw, butthe handle revolves in a circle. This means an increased leverage, so that the longer the screwdriver,the o-reater the leverage. … For heavy work, screwdriver-bits. Fig. 189, in a bit-stock are use-ful, and for quick work, the spiral screwdriver, Fig. 190, and forsmall work, the ratchet-screwdriver. It of the 7. MEASURING AND MARKING TOOLS. is a long step from the time when one inch meant the widththumb, and one foot meant the…
Woodwork
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