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Figure 2-24.-Architects scale.
Engineers  Scale - CONTINUED

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure  2-24  shows  the  triangular  architect’s scale.  Also  shown  are  segments  of  each  of  the eleven scales found on this particular type of scale. Notice  that  all  scales  except  the  16th  scale  are actually two scales that read from either left to right  or  right  to  left.  When  reading  a  scale numbered   from   left   to   right,   notice   that   the numerals are located closer to the outside edge. On scales that are numbered from right to left, notice that the numerals are located closer to the inside edge. Architect’s scales are “open” divided (only the main  divisions  are  marked  throughout  the  length) with the only subdivided interval being an extra interval  below  the  0-ft  mark.  These  extra intervals are divided into 12ths. To make a scale measurement  in  feet  and  inches,   lay   off   the number  of  feet  on  the  main  scale  and  add  the inches  on  the  subdivided  extra  interval.  However, notice that the 16th scale is fully divided with its divisions  being  divided  into  16ths. Now let’s measure off a distance of 1 ft 3 in. to see how each scale is read and how the scales compare to one another. (Refer to fig. 2-24.) Since the graduations on the 16th scale are subdivided into 16ths, we will have to figure out that 3 in. actually  is  3/12  or  1/4  of  a  foot.  Changing  this to 16ths, we now see we must measure off 4/16ths to equal the 3-in. measurement. Note carefully the value  of  the  graduations  on  the  extra  interval, which   varies   with   different   scales.   On   the 3 in. = 1 ft scale, for example, the space between adjacent  graduations  represents  one-eighth  in.  On the  3/32  in.  =  1  ft  scale,  however,  each  space between adjacent graduations represents 2 in. The scale 3/32 in. = 1 ft, expressed fraction- ally,  comes  to  3/32  =  12,  or  1/128.  This  is  the smallest scale provided on an architect’s scale. The scales on the architect’s scale, with their fractional equivalents,  are  as  follows: Engineer’s  Scale The chain, or civil engineer’s, scale, commonly referred  to  as  the  ENGINEER’S  SCALE,  is usually  a  triangular  scale,  containing  six  fully divided  scales  that  are  subdivided  decimally,  each major  interval  on  a  scale  being  subdivided  into 10ths.  Figure  2-25  shows  the  engineer’s  scale  and 142.321 Figure 2-25.-Engineer’s scale. 2-19







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