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PROTECTING  AGAINST Weather Hazards
USING  FIELD  EQUIPMENT  SAFELY

Engineering Aid 3 - Beginning Structural engineering guide book
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development  of  symptoms  is  often  confusing when an attempt is made to determine the time or  location  where  the  contact  with  the  plant occurred.  The  itching  sensation  and  subsequent inflammation  that  usually  develops  into  watery blisters under the skin may continue for several days from a single contamination. Persistence of symptoms  over  a  long  period  is  most  likely  caused by  new  contacts  with  plants  or  by  contact  with previously  contaminated  clothing  or  animals. Severe  infection  may  produce  more  serious symptoms   that   result   in   much   pain   through abscesses, enlarged  glands,  fever,  or  other complications.  Secondary  infections  are  always a possibility in any break in the skin that occurs when the watery blisters break. With   poison   ivy,   the   next   development   is usually  the  appearance  of  a  scabrous,  deep  red rash over large skin areas. With poison, sumac, it  is  usually  the  appearance  of  large  blisters,  filled with  a  thick  yellowish  white  liquid  strongly resembling  pus.  When  the  blisters  break,  this liquid  runs  over  adjacent  skin  areas  and,  thus, enlarges  the  area  of  infection. The resinous juice exuded by these poisonous plants  is  almost  entirely  nonvolatile;  that  is, nonevaporating or will not dry up. Consequently, the juice may be carried on clothing, shoes, tools, or soil for long periods. In this way, it may infect persons who have actually not come into contact with the plants themselves. Individuals have, in fact,  been  severely  infected  by  juice  carried through air by smoke from burning plants. Other persons  have  been  infected  by  resinous  juice  being carried  on  the  fur  of  animals. Figure 12-29.-Poison oak (leaves and fruit). To avoid contact with the plants themselves, you  must  have  an  idea  of  what  they  look  like. Poison  ivy  has  a  trefoil  (three  leaflet)  leaf,  as shown in figure 12-28. The upper surface of the leaflet  has  a  shiny,  varnished  appearance.  The variety  called  poison  oak  has  a  leaflet  with  a serrated, or lobed, edge like that of an oak leaf, as shown in figure 12-29. Ordinary poison ivy is Figure  12-28.-Different  varieties 12-29 of poison ivy leaves.







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