Show when rubber grows hot ahen hen an automo ible Is running at higi speed the rubber tires are rap idl warmed and the heat sometimes becomes very great with resultant anji ry to 0 o the rubber the cause of this accumulation of heat in the tire Is described bed to the kneading of the rubber which generates heat faster than it cm can be radiated away for this reason manufacturers have found it to lie an advantage to have metal parts in the tread such as the ends of ilvess in contact with the tire because the metal being a good radiator helps to carry off the heat to the outer air |