======================GFI===============================
                      
GFI                   1) 20uA directly to heart may cause ventricular fibrillation
                      2) dry skin 100K to 300Kohms lowest is 500ohms
                      3) normal hands 1500ohms
                      4) perception current 1mA
                      5) let go current 10mA women   16mA men
                      6) electrocultion 250mA =.1sec, 100mA =1sec 50mA=10sec
                      7) safe curtrent 6mA woment and 9mA men
                      8) DC current feels warm.
                      
                      
                      GFI.. current in amps fatal to nerves
                      current high enough to raise body temp is instant death
                      
                      cap discharg 50 jouls is dangerous
                      mA current in centeral nervious system may inhibit breath for some time
                      long let go = can't breath
                      
2mA                   Theshold sensation
7mA                   mild sensation
11mA                  painful
15mA                  cannot let go
20mA                  paralysis
70mA                  breathing labored
90mA                  breathing extremely difficult
110mA                 breathing stops lethal
200mA                 severe burns

Skin Resistance       wet 1k-> 500k  dry


Total Body Impedance                          Values for the total
                                              body impedance (ohms)
                                              that are not exceeded
                                              for a percentage
                                              (percentile rank) of
                      Touch Voltage           5%      50%     95%
                      (V)                     of the population
                      
                      25                      1750    3250    6100
                      50                      1450    2625    4375
                      75                      1250    2200    3500
                      100                     1200    1875    3200
                      125                     1125    1625    2875
                      220                     1000    1350    2125
                      700                     750     1100    1550
                      1000                    700     1050    1500
                      Asymptotic value        650     750     850
                      
                      "The values of the total body impedance given in Table 1 are valid for
                      living human beings and a current path hand to hand or hand to foot for
                      large contact areas (50cm^2 to 100cm^2) and dry conditions.
                      
                      "At voltages up to 50V, values measured with contact areas wetted with
                      normal water are 10% to 25% lower than in dry conditions and conductive
                      solutions decrease the impedance considerably down to half the values
                      measured in dry conditions.
                      
                      "At voltages higher than 150V total body impedance depends
                      only slightly on humidity and on the surface area of contact."
 
                      
Zone 1                Usually no reaction effects
Zone 2                Usually no harmful physiological effects
Zone 3                Usually no organic damage to be expected. Likelihood of muscular
                      contractions and difficulty in breathing, reversible disturbances of
                      formation and conduction of impulses in the heart, including atrial
                      fibrillation and transient cardiac arrest without ventricular fibrillation
                      increasing with current magnitude and time.
Zone 4                In addition to the effects of Zone 3, probability of ventricular
                      fibrillation increasing up to about 5% (curve c2), up to about 50% (curve
                      c3) and above 50% beyond curve c3. Increasing with magnitude and time,
                      pathophysiological effects such as cardiac arrest, breathing arrest and
                      heavy burns may occur."
                      
Zone 1                lies in region less than 0.5mA body current, for all durations. 
Zone 2                extends to about 500mA at 20ms or less duration, 
                      to 20mA at 1000ms duration and to 10mA at 10000ms duration. 
Zone 3                extends from the Zone 2 boundary to 1000mA for 10ms duration,
                      200mA for 500ms duration and 50mA for 10000ms duration.

                      
                                           
magnetic metals       rolly lindstrand FAE
                      Howard S. Leopold leviton 
                      ed arakelian delco
                      richard jenkins delco
                      
                      reps make 1% of sale
                      
                      magnetic metal   B.Finke,phd  july 22,1976
                      heat majes BH curve fater
                      grain oreinted ==easy and hard direction to magnitize
                      tape wound-wound by sheet,square bh curve
                      non oriented=round peaks
                      ferrite=goes to hell at -35C
                      
                      glen gross norlin music ,lincolnwood illin
                      
                      electomagnetic industries, lyn steve clear water florid
                      
                      
                      victor batinovich
                      jame henslee SCI