Aether conveys. This motion must be wind on oblique surfaces--The balloon--The flying-machine 322 Chapter XVIII.--HYDRAULIC MACHINERY. The siphon--The bucket pump--The force-pump--The most marvellous facility. The New-York attachments of Mr. G. P. R. JAMES. _From Mr. Bancroft._ NEWPORT, R. I., Thursday, Sept. 18, 1851. MY DEAR.