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The author having referred to his pi-evious papers on the co­efficients of the iodides of silver -and mercury, and of certain chlorobromidides of silver, continues the same methods of determining the coefficients of the iodide of lead, and of an alloy of the iodides of lead and silver. Various alterations in the apparatus, which by the diminution of friction and other means have rendered it much more delicate than before, are described. The iodide of lead was found to possess three coefficients of expansion; the first for temperatures between 0° and 205°C.— ·00008317 cubical expansion for 1°C.; the second, a very high coefficient, between 205° C. and 253° C.— ·0006378; and the third, for temperatures between 253°C. and the fusing point— ·000180.

proceedings of the royal society of london

I. On the coefficients of expansion of the di-iodide of lead, PbI <sub>2</sub> , and of an alloy of iodide of lead with iodide of silver, PbI <sub>2</sub> . AgI

I. On the coefficients of expansion of the di-iodide of lead, PbI 2 , and of an alloy of iodide of lead with iodide of silver, PbI 2 . AgI

I. On the coefficients of expansion of the di-iodide of lead, PbI ₂ , and of an alloy of iodide of lead with iodide of silver, PbI ₂ . AgI