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Home > History and Archaeology > History > Lessons and Practical Notes on Steam; The Steam Engine, Propellers, Etc., Etc., for Young Engineers, Students, and Others
Lessons and Practical Notes on Steam; The Steam Engine, Propellers, Etc., Etc., for Young Engineers, Students, and Others

Lessons and Practical Notes on Steam; The Steam Engine, Propellers, Etc., Etc., for Young Engineers, Students, and Others


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 edition. Excerpt: ...Or we proceed thus: Lay a straight-edge across the face of the propeller, at right angles to the axis, and a bevel on the periphery of the blade, and look them out of wind, the angle enclosed by the two legs of the bevel will be the angle B b, which is termed the "angle of the propeller;" and hence, if B b be supposed unity, the fraction of the pitch of the one blade will be (B a) the natural sine of the angle Bi, therefore, knowing the angle B b a, and the length of the blade B b, we ascertain the pitch thus: As cosine b: whole circumference of propeller:: sine b: to whole pitch. The pitch can also be determined by construction, without any calculation whatever. Thus, supposing the line a b represents the whole circumference of the propeller, we draw the line B b at the angle to a b ascertained from measurement, and erect the perpendicular a B, which will give the pitch required. In a true screw, it matters not whether we take the angle at the periphery or any other part of the blade; for, though the angle will be different, increasing as we approach the centre, the pitch will be the same, .it only being necessary to know the circumference at the point where we measure the angle. Should the blade not be a true screw, but an expanding pitch, we have to take the angle at two or more points, by drawing tangents to the curve, and take the mean, for the mean angle of the blade. Thus, in figure 5, the mean of the angles B b A and c G A will give the mean angle of the blade. Some propellers are made to expand from hub to periphery, instead of from anterior to posterior portion of the blade. To ascertain the pitch of such a propeller, take the mean of the angles at several points in the blade, and proceed as above. In order...


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Product Details
  • ISBN-13: 9781236842626
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 54
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1236842626
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 113 gr


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