COVERIES. gland by J. Napier Glasgow for an improved mode of forming stereotype plates. Under one modification of the process a smooth cast-iron plate is prepared to receive the plaster impression as follows :-A piece of cartridge paper is cut the size of the plate and pasted iweee of cream is then poured upon the paper and the sitrirace leveled to the required thickness by means of a 'straight edge.' The form containing the type locked up in the usual manner and oiled upon the surface is immediately inverted laid face downward upon the soft plaster and pressed and is thus allowed to remain until the plaster has hardened. The form is then lifted off and the plaster matrix dried from the metal side upon an ordinary type-founder's fur nace. A fiat cast-iron plate covered with paper is provided with metal gages to regulate the thickness of the stereotype plate. The matrix plate is now screwed to this plate and when both are well heated the molten metal is poured in between and an exact counterpart of the form is obtained. After cooling it is planed and finished. ent for converting iron into steel as follows :-A mix ture of carbonate of baryta and finely pulverized bit uminous coal is placed in a crucible or into a retort and bars or pieces of less size of iron are placed among this mixture and the whole heated to a bright red heat at which temperature it is maintained for several hours. After this roasting the metal is taken out and cooled and when broken it is stated to have the grain and hardness of steel and is capable of being wrought and tempered. is the substance orthe specification of a patent taken out by Thomas Bell of Gateshead England for de composing compounds of aluminum (such as the double chloride of aluminum and sodium) by gal vanic electricity and coating metals such as copper by the same agency. A bath is made up composed of the double chloride of aluminum and sodium in an anhydrous state and this is kept melted at a tem coated with aluminum is placed
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