抄録
The authors studied the distribution and the value of casting stresses in a bell by cutting it in round slices.The stresses showed the maximum value in the vicinity of the change of the thickness in it and these stresses may be considered as contributing to the sound. In spite of the fact that the sound was generally improved in proportion to the increase of tin content, an excessive content of tin retarded resistance to a blow by a wooden bell hammer. The authors pointed out that the content of tin in bells must be in the range of 11% to 13%. On the other hand, various defects in Komano-tume (the lower part of bells) had bad effects on the sound,and must be rectified as for as possible by using a moderate method. A marked segregation in bells was almost due to the construction of mould and the suitable cooling velocity for segregation.
