抄録
A new formula for computation of the distribution of internal stress in cylindrical glass scaled between two different metals is derived under the same condition as assumed in the derivation of Hull-Poritsky formula which is for single glass-metal seals. When two different metals are given with their known thermal dilatational characteristics, a suitable glass, which, when sealed, exhibits such quality as to withstand uneven sudden excessive heating, is assign-ed by the formula.
For verification of the formula, a photoelastic study of the internal stress was made on an experimental product using Babinet Compensator. Agreement with the formula is not as expected, nevertheles, considering the involved technique in making and the assumptions made in the derivation of the formula, the usefulness of the formula is on the whole proved.
