. Transactions. the machining. The fact that the tenacity and yield point of Group 3 arepractically the same after the hr. stay at 685° as after hr. stay there indicates that decarburization was effectivelyprevented, because if it had taken place to an appreciabledegree it would have lowered both these properties. Furtherevidence in the same direction is the actual increase of thetenacity and yield point in Group 1 between the hr. stayand the hr. stay at 685°. The eight specimens of Group 1 were treated simultaneouslyand side by side, up to the point at which they were se
. Transactions. the machining. The fact that the tenacity and yield point of Group 3 arepractically the same after the hr. stay at 685° as after hr. stay there indicates that decarburization was effectivelyprevented, because if it had taken place to an appreciabledegree it would have lowered both these properties. Furtherevidence in the same direction is the actual increase of thetenacity and yield point in Group 1 between the hr. stayand the hr. stay at 685°. The eight specimens of Group 1 were treated simultaneouslyand side by side, up to the point at which they were severallyremoved from the furnace for air-cooling. The same is true ofthe specimens of each of the other groups of Steel l>lo. IV. In 546 DIVORCING ANNEALING. 6i PIB8t 11 ¥l#P3i>03--I!V _ i9 puE c9#.pa[ooD-i!y OS#paiooo-i!V ? E. 0 s33ao3a 3anivu3diN3i DIVORCING ANNEALING. 547 the air-cooling the bars were laid horizontally with their endsresting on fire-bricks in the open air of the laboratory, and farenough apart not to influence each other sensibly. The hr. heating of Group 1 was not under direct ob-servation during the night, but previous experience under likeconditions makes it reasonably certain that the temperaturedid not deviate far during this period. The hr. heatingof Group 3 was controlled during the night by an autographicpyrometer, which showed that the temperature then did notpass beyond the limits of 675° and 710° given for the begin-ning and end of the night period. Fig. 2 shows all the results,and gives the maximum, minimum, and average for eachgroup, except in a very few cases in which the results agreedso closely that the differences between them cannot conven-iently be represented thus. Fig, 3 shows the maximum, mini-mum, and average of these same results taken together instead
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
