Show acetylene and air in a mixture with air the ablott of neetY lelle capable of kropa gating flame la Is pet pel cent nad mill tile lie largest amount Is about 73 percent per cent nc cording to tile the tests of 1 I 1 A k burrell und ami 0 U G oberfell for the united states bureau of mines will air acetylene Is explosive dintler it 11 pres sure of 3 to 5 es when IL H tin nn electric spark Is pissed through it or when nhen a platinum spiral la is 11 in it Cali luin carbide in it 11 inano brings little risk when tile lio material Is carefully handled |