Our Iron-Clad Ships; Their Qualities, Performances, and Cost

Overview

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1869 Excerpt: ...records are made in accordance with a detailed scheme of instructions issued by the Admiralty, and embrace accounts of the state of the sea, and force and direction of the wind; the stowage, draught, and course of the ship; and the angles rolled through, as well as the number of oscillations per minute. The ...
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Overview

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1869 Excerpt: ...records are made in accordance with a detailed scheme of instructions issued by the Admiralty, and embrace accounts of the state of the sea, and force and direction of the wind; the stowage, draught, and course of the ship; and the angles rolled through, as well as the number of oscillations per minute. The two last-named features supply information as to the range and the rate of the ship's rolling respectively. The angles recorded are always the total angles rolled through; in other words, the sum of the angles to port and starboard. The oscillations recorded are the number of times the ship passes from port to starboard, and vice versa, per minute. Three instruments are in general use in our Navy for measuring the angles of roll--the pendulum, the clinometer, and the bar or batten instrument. The last alone is correct, and is used in all the ships of the French navy, the angle being determined by an observation of the horizon. The pendulum is a very bad instrument for measuring the roll, usually indicating larger angles than the ship moves through, especially when she is rolling heavily. We should anticipate this from the fact that, even when a vessel is rolling moderately, everything which is freely suspended on board is put into violent motion. In order to illustrate the errors of the pendulum and the mistakes which must arise from its employment, I need only turn to Admiral Warden's Report. On one occasion the 'Lord Warden's' rolling amounted to 114 degrees according to the pendulum, but only reached 9-l degrees according to the bar instrument; and on another trial the indications of the two instruments gave 14" 9 and 12 degrees respectively as the angle of roll. These are, as we shall see, by no means the greatest differences which are recorded,...
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Product Details

  • ISBN-13: 9781150367434
  • Publisher: General Books LLC
  • Publication date: 5/28/2012
  • Pages: 92
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.19 (d)

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