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Chapter 8 Rules and Steel Tapes
Using Rules and Tapes Examples

Tools And Their Uses - Hand tools and what they are used for
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TM 9-243 TYPES AND USES The rule or tape is used for measuring where accuracy is not an extremely critical factor. They can be rigid or flexible, come in various lengths, and can be made of wood, metal, cloth, or fiberglass. RULES The rule is the most common of measuring tools. This rule is usually 6 or 12 inches in length, although other lengths are available. Steel rules may be flexible or nonflexible, but the thinner the rule, the easier it is to measure accurately because the division marks are closer to the work. A rule usually has four sets of graduations, one on each edge  of  each  side.  The  longest  lines  represent  the  inch marks. On one edge each inch is divided into 8 equal spaces  so  each  space  represents  1/8  in.  The  other  edge of  this  side  is  divided  in  sixteenths.  The  1/4-in.  and 1/2-in. marks are commonly made longer than the smaller division marks to facilitate counting, but the graduations are usually not numbered individually, as they are sufficiently far apart to be counted without difficulty. The opposite side is similarly divided into 32 and 64 spaces per inch, and it is common practice to number every fourth division for easier reading. There are many variations of the common rule. Some- Steel  tapes  are  made  from  6  to  about  300  feet  in  length.. times  the  graduations  are  on  one  side  only,  sometimes a The shorter tapes are made with a curved, but rigid, set  of  graduations  is  added  across  one  end  for  measur- ing  in  narrow  spaces,  and  sometimes  only  the  first  inch cross  section  flexible  enough  to  be  rolled  up.  Long,  flat is divided into 64ths, with the remaining inches divided tapes need support over their full length to avoid sag- into  32nds  and  16ths.  A  metal  or  wood  folding  rule  may ging. Lack of support can cause reading errors. The most common types of steel tapes have a hook at one be used. end to let one person take all the readings. FOLDING RULES These folding rules are usually from two to six feet long. The folding rules cannot be relied on for extremely accu- rate measurements because a certain amount of play develops at the joints after continued use. STEEL TAPES 8 - 2







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