Mechanics' magazine and register of inventions and improvements . ingenious country-men. The originality of the invention wasestablished by the most satisfactory defendant, however, called an as a witness, who had been a shorttime in the country, and who testified mostexplicitly to the existence of a like inven-tion in the improved machinery in such positive proof there was muchdifficulty in proceeding. The testimony,though doubted, could not be discredited ;and the trial was postponed to another term,for the purpose of procuring evidence to re-but it.
Mechanics' magazine and register of inventions and improvements . ingenious country-men. The originality of the invention wasestablished by the most satisfactory defendant, however, called an as a witness, who had been a shorttime in the country, and who testified mostexplicitly to the existence of a like inven-tion in the improved machinery in such positive proof there was muchdifficulty in proceeding. The testimony,though doubted, could not be discredited ;and the trial was postponed to another term,for the purpose of procuring evidence to re-but it. An agent was despatched to Eng-land for this and other objects ; and, uponhis return, the plaintiff was content to be-come nonsuited. There was no doubt thatthe invention here was without any suspi-cion of its existence elsewhere ; but the ge-nius of each country, almost at the samemoment, accomplished, independently, thesame achievement. History of Chemistry. [Continued from No. 5, page 229.]Of Oxygen Gas.—Oxygen gas may beobtained by the following process:. 29S an iron tube bent like B is to be fitted bygi-inding. A gun-barrel deprived of its buttend answers the purpose very well. Intothe bottle put any quantity of the black ox-ide of manganese* in powder ;, fix the irontube into its mouth, and the joining must beair tight; then put the bottle into a commonfire, and surround it on all sides with burn-ing coals. The extremity of the tube mustbe plunged under the surface of the waterwith which the vessel C is filled. This vessel may be of wood or japannedtin plate. It has a wooden shelf runningalong two of its sides, about three inchesbelow the top, and an inch under the surfaceof the water. In one part of this shelf thereis a slit, into which the extremity of the irontube plunges. The heat of the fire expelsthe greatest part of the air contained in thebottle. It may be perceived bubbling upthrough the water of the vessel C from theextremity of the iron tube. At first the air
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