Scientific American Volume 12 Numéro 22 (mai 1865) . avis pour une longue période est la machine à scier le bois de J. L. Knowlton, ofPhiladelphia, une gravure de ce qui peut être trouvé onpage 128, Tome X., Scientific American. C'est ap-pour le sciage applicables soit bois lourd ou léger tocurves ou formes irrégulières. Elle est entrée en generaluse dans nos plus grandes et meilleures verges. Dans un récent avis de M. Sinclair, chantier naval à Phil-adelphia par inadvertance, nous avons parlé de lui comme l'en-ventor de la machinerie utilisée dans sa cour. Nous shouldhave a déclaré que l'amélioration de machines à scier utilisée par M. Lynn a été l'invention de

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Scientific American Volume 12 Number 22 (May 1865) . notice for a long time isthe timber sawing machine of J. L. Knowlton, ofPhiladelphia, an engraving of which may be found onpage 128, Vol. X., Scientific American. It is ap-plicable for sawing either heavy or light timbers tocurves or irregular forms. It is coming into generaluse in our largest and best yards. In a recent notice of Mr. Lynns shipyard, in Phil-adelphia, we inadvertently alluded to him as the in-ventor of the machinery used in his yard. We shouldhave stated that the improved sawing machinery usedby Mr. Lynn was the invention of Mr. Knowlton; itwas the latter gentleman we had in mind when sta-ting that we have had at our office a number of hisInventions, all of which possessed ingenuity and util-ity. DEATH OF WILLIAM SEWELL. It is with regret at the loss of an able, skillful andthinking member of the engineering profession thatwe announce the decease of Mr. William Sewell. This gentleman died at his residence in Lexingtonavenue, this city, on the morning of the 12th Inst.. the burner it is necessary to hold it in a position topour the oil into the lamp, and at the same time pre-vent the wick from besmearing the same. The de-sired end is successfully accomplished by the accom-panying device. The invention consists in providinga spring, A, kinged at the lower portion of the burner, Launch of a Huge English Iron-clad. The iron ram frigate Betterophon was safely floatedout of the dock at Chatham, in the presence of alarge concourse of spectators. She was laid down inApril, 1864, on lines supplied from the Comptrollersoffice, for a frigate of 14 guns, 4, 246 tuns, and 1, 000-horse power. When the ship left the dock the tidehad risen to 20 feet 4 inches, which was a remarkablehigh flow, and the Bellerophon was very quicklyalong the sheer hulk, where she is to remain for onemonth to get her boilers, engine, gear, and masts onboard. At present she is almost a skeleton, and herarmor-plating fixed is only in the

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