Note 51 — Chapter I

There is more in Bramah’s inventions than at first appears, and the scientific reader would do well to study that part of them referring to the “boiler.” The following remarks have reference to the screw:—

“Instead of the (paddle-wheel) A, may be introduced a wheel with inclined fans or wings, similar to the fly of a smoke-jack, or the vertical sails of a windmill: this wheel or fly may be fixed on the spindle C alone, and may be wholly under water, where it would, by being turned round either way, cause the ship to be forced backwards or forwards, as the inclination of the fans or wings will act as oars with equal force both ways, and their power will be in proportion to the size and velocity of the wheel; allowing the fans to have a proper inclination, the steam-engine will also serve to clear the ship of water with singular expedition, which is a circumstance of much importance. This “apparatus for working the ship” is fixed in or beyond the stern, in or about the place where the rudder is usually placed, and its movement is occasioned by means of an horizontal spindle or axletree conveyed to the engine through the stern end of the ship.”