. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fi?. C. This invention consists in a mode of raising screw and other similar stern prcipellers, when the same are fixed ahaft the stern-post. Fig. 1 shows the mndc of effecting this object, a a is a rectangular framework of iron, which su|)ports at its lower end a hollow shaft b, carrying the vanes of the pro- peller and working freely in the plummer blocks ec. The rectangular frame a a is provided with projecting pieces a' a' which fit into and are attached to a sliding piec
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fi?. C. This invention consists in a mode of raising screw and other similar stern prcipellers, when the same are fixed ahaft the stern-post. Fig. 1 shows the mndc of effecting this object, a a is a rectangular framework of iron, which su|)ports at its lower end a hollow shaft b, carrying the vanes of the pro- peller and working freely in the plummer blocks ec. The rectangular frame a a is provided with projecting pieces a' a' which fit into and are attached to a sliding piece d, in a similar manner to a hinge joint. This sliding piece d (I is capable of moving freely upon a strong frame e e, which latter is firmly bolted to the counter of the vessel. / is the propeller shaft which passes through a hollow shaft or tube g, the propeller shaft being squared at its outer end so as to fit the hole formed in the boss or hollow shaft A, which hole is of the same figure. A represents a chain, one end of which is at- tached to the rectangular frame a, the other being attached to a capstan or windlass on board the vessel. When it is necessary to raise the propeller, the square end of the shaft/is withdrawn from the boss or shaft 4, then, by giving motion to the wmdlass, the part d will slide upon the frame ee, car-^ rying with it the rectangular frame o a and propeller. The advantages of this arrangement are stated to be, that the propeller may be placed lower down than heretofore, and consequently a larger propeller may be em- ployed, moreover the water passing from the propeller will meet with less obstruction against the sides of the vessel, and which vessel will be less sub- ject to that tremulous motion caused by the action of the propeller. Tbe second improvement consists in disconnecting the propelling shaft from the driving shaft, thereby allowing the former to run loose upon its axis when the vessel is required to be worked with sails only, or when
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Keywords: ., boo, bookcentury1800, booksubjectarchitecture, booksubjectscience
