. Transactions. h to a temperature of about 700° C, or well above theupper heat effect. The bar was then slowly moved along to the coolerportions of the furnace, and finally partially removed from the furnace soas to cause the temperature of one end to fall gradually from 700° C. to 7Mv. 5Mv 500 C 4Mv. : Ci -^ Sr -21 : 57 c. 57, 5°C. 1 . — —:. 52 kJ: 50 i°C. — ^ •—? =--^ ?--=^ Jy 504 -• :• , 58D Minown 1 M n. Up 5 10 15 20 25SECONDS Plate I. about 400° C, while the temperature of the other end remained about asbefore. The bar was held in this condition for 8 hr. and then suddenlyque
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. Transactions. h to a temperature of about 700° C, or well above theupper heat effect. The bar was then slowly moved along to the coolerportions of the furnace, and finally partially removed from the furnace soas to cause the temperature of one end to fall gradually from 700° C. to 7Mv. 5Mv 500 C 4Mv. : Ci -^ Sr -21 _ : 57 c. 57, 5°C. 1 . — —:. _ 52 kJ: 50 i°C. — ^ •—? =--^ ?--=^ Jy 504 -• :• , 58D Minown 1 M n. Up 5 10 15 20 25SECONDS Plate I. about 400° C, while the temperature of the other end remained about asbefore. The bar was held in this condition for 8 hr. and then suddenlyquenched in cold water. One side was ground down, poHshed, and etchedwith ferric chloride. As was expected, the complete transition from the high- to the low-temperature modifications could be observed. These are reproduced inFigs. 1 to 6. Fig. 1 shows the high-temperature modifications, whichmay be called a and /3. At a position corresponding to a somewhat 200 CONSTITUTION OF TIN BRONZES. Fig. 1.—Hot end. Fig. 2.