. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. " The first experiments (on any thing like a large scale) were on board the jlirnlite, a vessel (J9 feet long, and 9 feet beam. They were intended only to ascertain how far the apparatus was adapted to sail- ing vessels, for the purpose of moving them about in calms, or as an auxiliary to the wind and sails. The powerful effect produced by the rotation of these 'quarter propellers,' even by manual power, was enough to establish the fact, that any vessel, however large, m
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. " The first experiments (on any thing like a large scale) were on board the jlirnlite, a vessel (J9 feet long, and 9 feet beam. They were intended only to ascertain how far the apparatus was adapted to sail- ing vessels, for the purpose of moving them about in calms, or as an auxiliary to the wind and sails. The powerful effect produced by the rotation of these 'quarter propellers,' even by manual power, was enough to establish the fact, that any vessel, however large, may be moved in an opposite direction to that line in which the force is ap- plied, quicker or slower, according to the extent of the motive power. "The next experiments were made with a model of a steam-boat, which is now exhibited at the Polytechnic Institution. This model is sup|)lied with the means of applying a great variation of power to the propellers, and it admits also of great variation in the shape of them, by which means I have had an opportunity of judging upon the merits of screws, sections of screws, and planes; and of testing the angle of incidence, the shape of the vane or blade, and the relative proportions they should bear one to the other, according to the power applied. Although a screw is decidedly a powerful instrument in the water, I must nevertheless give the preference to the plane and to the figure shown in the accompanying drawing, because it produces the greatest speed with the least sacrifice of power, more especially when the vanes are set at the angle of 30^ or 35° to the axis of the shaft. And here I would remark, and hope without presumption, that if any merit may be attached to this part of my invention, it consists in the discovery by careful experiment, that a plane having the proportions of my propeller, as represented in the drawing, will, when set at the above angles, and revolving in the water, impel a vessel by means of a locomotiv
Size: 1357px × 1842px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectarchitecture, booksubjectscience
