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Good management of the melting-ovens is of capital importance ; the perfect homogeneity of the material is also one of the conditions of success. Glass that has remained a long time in the crucible, and that has thus maintained for too long an elevated temperature, tends to'give way to a commencement of devitrifieation; in this state it will break in the bath. ,The work also should proceed rapidly and never be interrupted when it is desired to utilize the great part of the material contained in the crucible. A glass which presents a striated appearanee--a defect likely to be produced if the management of the oven is not regular--will not adapt itseli to toughening.
๐ SIMILAR VOLUMES
not covered in any detail. This would presumably limit the temperature range of this device. The effect that temperature variations have on the pressure in the hydraulic circuit -when the pressure is locked in -is also not covered. This latter factor could cause very significant pressure variations.
If. I)cllcoll. T. L' lctclier. 11. GuJkcll,jiin. -~~~~~ ~ iii his o~vii stiitlciit cliiys, ~vlicii soinc cnrliolic acid was rcqiiircd iiiitl tlicrc WIS iiotliiiig to prcliiire it froiii csccpt the iilkiiliiie wiisliings of soinc coal tiir-lie \ Y ~S I I ~Y C P surprised to find clIciiiicn~ riiritie