239.372Figure 10-7.-Hand press.a well-sharpened blade and a secure handle.DON’T use any knife as a screwdriver, a punch,or a pry to open can lids. Always cut away fromyou, and keep your hands out of the way of theblade.To sharpen a knife, use an oilstone and applythe same basic principle as that used forsharpening shears. Do NOT sharpen a knife bladeon a grinding wheel because the metal is too thin.Too much heat is generated for the thickness ofthe metal. To sharpen a knife, clean the oilstoneof all gum and dirt accumulation. Put two or threedrops of medium-light oil on the stone. Lay theknife on the stone with the back of the knifeslightly raised. Draw the knife toward you witha diagonal stroke from heal to toe with the cuttingedge advancing. Turn the knife over and movethe blade away from you, cutting edge advancing,moving from heel to toe. Repeat these stepsseveral times. The edge is sharp if you feel adecided drag when passing it lightly over a wetthumbnail. No drag indicates the edge is notsharp.MEASURING DEVICESThe ruler, tape measure, and carpenter’ssquare, as shown in figure 10-8, are used oftenduring the repair of fabric and rubber articles.These may become special tools by adding aspecial mark to show a commonly used scale ormeasurement. To comply with technical directivespecifications, be sure to exactly measure items239.373Figure 10-8.-Measuring devices.such as the patch overlaps, length of lines on liferafts, and every other job you do that requiresspecial measurements.The 12-inch, plain steel rule is used for layingout and measuring small work. One side of therule, shown in view A of figure 10-8, has one edgegraduated in sixteenths of an inch and the otheredge graduated in eighths of an inch. This isindicated on the rule by the numbers 16 and 8,which are stamped into the metal. The opposite10-11
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