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DRAWING   SYMBOLS Because  of  the  small  scale  used  in  most drawings, standard graphic symbols are used to present   complete   information   concerning   con- struction   items   and   materials.   These   typical symbols  are  used  so  frequently  in  construction drawings that their meanings must be familiar not only to the preparer, but to the user as well. The main information sources for a particular symbol are the Military (Drawing) Standards (MIL-STD) and  the  American  National  Standards  Institute (ANSI). Refer to these standards before you use other  references.  Listed  below  are  some  of  the most commonly used military standards and the particular  symbols  they  carry. Standard Description MIL-STD-14 Architectural Symbols (latest revision) MIL-STD-17-1 Mechanical   Symbols   (latest revision) MIL-STD-18 ANSI Y32.9-1972 Structural   Symbols   (latest revision) Graphic Symbols for Electrical Wiring and Layout Diagrams Used   in   Architecture   and Building  Construction ANSI  Y32.4-1977 Graphic Symbols for Plumbing Fixtures for Diagrams Used in Architecture and Building Con- struction ANSI/AWS  A2.4-1986 Symbols for Welding Sometimes  you  may  notice  that  other  sym- bols  are  not  included  in  any  of  the  standards mentioned earlier. These symbols, like the ones shown in figure 10-6, can be found in one of the military   handbooks   developed   by   NAV- FACENGCOM  for  project  drawings.  As  an  EA, you  will  find  that  your  knowledge  of  applicable symbols will greatly assist you in accomplishing the  job  correctly  and  promptly,  and,  above  all, with confidence. Some of the basic architectural and  welding  symbols  are  shown  in  figures  10-7 through 10-10. Other types of symbols are shown in  the  appendix  section  of  this  book. DRAWING   NOTES NOTES   are   brief,   clear,   and   explicit statements  regarding  material  use  and  finish  and Figure 10-6.-Symbols used to identjfy sections, elevations, and  details. construction  methods.  Notes  in  a  construction drawing  are  classified  as  specific  and  general. SPECIFIC  notes  are  used  either  to  reflect dimensioning  information  on  the  drawing  or  to be explanatory. As a means of saving space, many of the terms used in this type of notes are often expressed  as  abbreviations. GENERAL notes refer to all of the notes on the drawing not accompanied by a leader and an arrowhead.  As  used  in  this  book,  general  notes for a set of drawings covering one particular type of work are placed on the first sheet of the set. They should be placed a minimum of 3 in. below the  space  provided  for  the  revision  block  when the  conventional  horizontal  title  block  is  used. When  the  vertical  title  block  is  used,  you  may place  the  general  notes  on  the  right  side  of  the drawing.   General   notes   for   architectural   and structural drawings may include, when applicable, 10-9

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