. Transactions. equilibrium is attainedmuch more rapidly in small than in large masses of metal, and that ac-commodation effects are always much less prominent. Briefly, the explana-tion of this is that in the smaller mass of metal there is less room to set upthose internal stresses and inhomogeneities, the releasing of which causesthe accommodation effects. The previous pressure maximum of 78,000 lb. was slightly exceededon the second application, pressure being pushed to 82,000 lb. Theslight additional set of in. ( mm.) on the second application wasalmost entirely produced by this
. Transactions. equilibrium is attainedmuch more rapidly in small than in large masses of metal, and that ac-commodation effects are always much less prominent. Briefly, the explana-tion of this is that in the smaller mass of metal there is less room to set upthose internal stresses and inhomogeneities, the releasing of which causesthe accommodation effects. The previous pressure maximum of 78,000 lb. was slightly exceededon the second application, pressure being pushed to 82,000 lb. Theslight additional set of in. ( mm.) on the second application wasalmost entirely produced by this excess pressure. On release of pressure,there were pronounced hysteresis effects, doubtless the result of the p. W. BRIDGMAN 159 slight additional flow produced by the excess 4000 lb. The total re-covery on release was at the same average rate as the linear rate on appli-cation of pressure, namely in. ( mm.) per 100,000 lb. per sq. completion of the stretching, the bore was measured at the Navy. 30 40 Pressure 1- Fig. 9.—Second application of pressure to the muzzle. The increase ofoutside diameter (ordinate) is shown in inches against the internal pressurein thousands op pounds per square inch. Yard. Fig. 10 shows the internal permanent stretch at various points ofthe bore. The minimum at 33 in. corresponds to the transition from breechto muzzle. With the experience gained from this first trial it would evi-dently be possible to improve the position of the packing plugs so that the -rr~ rrr- crrn j ir[||||||||i||||||i||||i|||il|||||l|Hj4fi 20 ^^^^ 1; ■ II llll[ll[lll[ 10 ::: ■§■1^^ :;;;;;;;;;;;;; 00 .... 1it: P Si:;;;;;;;;;;;;;;;:;;::;:;;;;::::;:;;:: -J-:::::::::::::::::::::::::::::::::::- ■-+ ■ !J 1 rr 0 10 20 30 40 50 60 70Fig. 10.—Total internal stretch after treatment, in inches (ordinate)AS function of position, in inches, on axis of gun (abscissa). Crosses show POSITION of packing DURING APPLICATIONS OF PRESSURE TO BREECH ALONE, ANDCROSSES
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
