Stability, the seaman's safeguard |
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Stability, the Seamangçös Safeguard: Being A Contribution Towards ... Edmund Gardiner Fishbourne No preview available - 2009 |
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angle of inclination arcs of roll ballast tanks beam ends bottom breadth capsize Captain centre of figure centre of gravity centre of immersed change the direction cubic contents cubic foot danger displacement distance effect empty figure when inclined FISHBOURNE free water further greater immersion heavy helm high centre hollow immersed body immersed figure incline the ship increase leaks less Let Fig lever of stability lever Z G lifting action lifting power line of pressure little stability low centre masts mersed metacentric height middle line midst of waves moreover opposite direction particles perpendicular proportion raise the centre reduced represent resolved thrust rolling motions safe safety sail seaway skin smooth water solids of immersion specific gravity stiff ship stowage suppose tend tons of ballast topgallant topgallant sail upward pressure vertical vessel is inclined water line water-line when upright wave face wave moves weather weight wind couple Wreck Register
Popular passages
Page 1 - And wisdom and knowledge shall be the stability of thy times, and strength of 'salvation : the fear of the LORD is his treasure.
Page 38 - The effort of stability is the lever by which a wave forces a ship into motion — if a ship were destitute of this stability, no wave that the ocean produces would serve to put her in motion.
Page 49 - ... Mercantile Marine when they have small stability. The marvel is, not that there are so many collisions and other accidents, but that there are not more ! In conclusion, we remark, that of the vast number of vessels that we have a record of, not one appears to have been rolled over because of having too much stability, while numbers are clearly lost every year from having too little, a further demonstration that the theory of rolling over by accumulation from synchronism, is without foundation....
Page 53 - ... pipe lines, etc. , should understand the business in all its details. While the decrease in the rock pressure during the past year throughout this area is universal, it has not been uniform. The gas in the Indiana field is entrapped in the Cincinnati arch, held there by a hydrostatic pressure equal to the weight of a column of water, the height of which is the difference in altitude between the surface of the water within the arch and the land surface of the catchment area. From this it is seen...
Page 42 - Weather currents and tides are exceedingly dangerous to vessels with little stability ; these make the wave exceedingly wall-like in form, so much so as to be a certain danger to vessels with high centres of gravity, as these seas would readily throw such on their beam ends. These circumstances, the extreme ranges of draught in steam vessels, from lessened specific gravity of cargoes, and other things, involve the advocates of high centres of gravity with little stability on -any pretence (and it...
Page 46 - ... only 2°. Her rolling on her side is evident from her rolling 45° one way and only 13° the other. Her rolling quickly seems a contradiction to the statement as to her long period, it may have been true, however, as to the first half of her roll, that forward, as she was then under so much pressure. It is obvious that her stability was little. How then account for her rolling on her side ? Having little stability, a steep-faced wave partly by impact and by its lifting power would raise one side...
Page 39 - ... which is offered to change from the vertical position ; the effort of the fluid or gravity to restore the body to the rest it may have been disturbed from. It is derived from two sources, a low position of the centre of gravity, and a broad plane of flotation. If a vessel is inclined in smooth water both kinds will resist further inclination, or will seek to restore the vessel to the perpendicular at which she rested. If the water-level be inclined, as in the case of a wave, that portion of the...
Page 38 - a wave forces a ship into motion, that if a ship were destitute of this " stability no wave that the ocean produces would serve to put her in " motion, whether that stability were due to a broad plane of flotation " or deeply-stowed ballast." There is no foundation for this statement, for stability is the resistance which is offered to change from the vertical position ; the effort of the fluid or gravity to restore the body to the rest it may have been disturbed from. It is derived from two sources,...
Page 41 - Meta-centrcs. ym and g' m'. Meta-centric heights. Therefore the attempt to estimate rolling motions from any power resist inclination round a fixed axis by a lateral force, such as wind in smooth water, is misleading ; and to assume an analogy between motions in the midst of waves and those produced by racing men from side to side, is delusive in the highest degree. The motion produced by waves must vary with their height, distance apart, and the greater or less rapidity with which they move across...
Page 41 - ... this process must take place irrespective of the stability being less or more, for the falling and rising must follow hollows and waves. Moreover, it is obvious that the point round which the body rotates is always changing, and is always outside the ship and at the opposite side from the moving force which operates first at one side, passes across, and then commences from the other side first. (See Fig. 3.) FIQ.