Show n J Most 1 people believe bellee that a thick tumbler stands treat heat better than thana a thin one Science however discountenances nances this belief tince LInce It has hns been proved pro that glass Is a very poor conductor conductor con con- ductor of ot heat and when hot water water Is poured Into a thick glass tumbler the inner layers of the glass glas are soon at a much higher temperature than the outer layers This high temperature tempera tempera- ture causes a great expansion lon an and the outer layers are then hurst by the expansIon ez- ez s- s I of the Inner on ones |