Physical Properties of an Extensive Series of Alloys of Iron. | 113 
Beginning with a series of carbon steels, the results are given in Table I. The 
first column gives the mark attached to each specimen; the next the principal 
constituents (the complete analysis of each specimen will be found in Part I. of 
these researches *) ; the lengths in centimetres of wax melted when a steady 
temperature is attained are given in the third column, then the square of these 
lengths; and in the last two columns the relative thermal and electrical conduc- 
tivities of the specimens are given, referred to the standard iron as 100. ‘The last 
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{ 23 45 6 7 8 9 10 fh 12 13 14 15 16 17 18 19 20 2I 22 23 24 25 26 27 28 29 30 Si ae 
—— Percentage of Added Element 
Ere. 1. 
two specimens in Table I., Nos. 611 and 614, belong to a different series of 
carbon steels (called series B in our previous memoirs), containing higher 
manganese, and their conductivity is accordingly lower. In the right-hand top 
corner of fig. 1 these results are shown plotted in a curve, the abscisse being 
percentages of carbon, and the ordinates L’, the relative thermal conductivities. 
* Sci, Trans. Roy. Dub. Soe., vol. vui,, part iv., January, 1900, 
