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Re: Technical Question: swinging ships and compass deviations. Y. Osman (SOAS London)

I believe the reference is to a practice for calculating an individual ship compass' deviation, which varies by heading (unlike variation, which is a constant at different places on the earth's surface). You swing the ship through 360 degrees, noting the error that arises in the compass bearing, compared to a standard magnetic bearing. I've never done it, so can't explain it well, but there are websites that do, e.g. http://www.skysailtraining.co.uk/compass_variation_deviation.htm

Re: Technical Question: swinging ships and compass deviations. Y. Osman (SOAS London)

In swinging ship to calibrate the compasses, it is pointed accurately on various known bearings and the deviation of the compass noted. If the compass cannot be compensated to null out the deviation, a table is prepared and kept at the compass to permit correction of observed bearings/courses.Good practices calls for observing the deviations at the cardinal and intercardinal points, at least. One of those tedious details essential for safe navigation. Unfortunately, many factors can cause changes in deviations.

Re: Technical Question: swinging ships and compass deviations. Y. Osman (SOAS London)

Yusuf, It is the same principle as a compass rose for aircraft. ONe simply swings through the entire 360 degrees of cardinal directions, for a ship this is more important. With an aircraft one is fixed on the ground with little deviation simply lining up with true north and correcting one's "whiskey" (magnetic) compass takes care of calibration and setting for local magnetic variation.

Pages

H-War Book Reviews

Author: 
Derek R. Sweet
Reviewer: 
Nicholas Rudnik

Rudnik on Sweet, 'Star Wars in the Public Square: The Clone Wars as Political Dialogue'


Derek R. Sweet. Star Wars in the Public Square: The Clone Wars as Political Dialogue. Critical Explorations in Science Fiction and Fantasy Series. Jefferson: McFarland, 2015. 224 pp. $35.00 (paper), ISBN 978-0-7864-7764-7.

Reviewed by Nicholas Rudnik (University of Florida)
Published on H-War (June, 2016)
Commissioned by Margaret Sankey

Author: 
Ronald M. Smelser, Edward J. Davies II
Reviewer: 
David Wildermuth

Wildermuth on Smelser and Davies II, 'The Myth of the Eastern Front: The Nazi-Soviet War in American Popular Culture'


Ronald M. Smelser, Edward J. Davies II. The Myth of the Eastern Front: The Nazi-Soviet War in American Popular Culture. Cambridge: Cambridge University Press, 2008. xii + 327 pp. $75.00 (cloth), ISBN 978-0-521-83365-3; $21.99 (paper), ISBN 978-0-521-71231-6.

Reviewed by David Wildermuth (Shippensburg University)
Published on H-War (June, 2016)
Commissioned by Margaret Sankey

Author: 
Peter N. Carroll
Reviewer: 
Brian R. Price

Price on Carroll, 'From Guernica to Human Rights: Essays on the Spanish Civil War'


Peter N. Carroll. From Guernica to Human Rights: Essays on the Spanish Civil War. Kent: Kent State University Press, 2015. 216 pp. $34.95 (cloth), ISBN 978-1-60635-238-0.

Reviewed by Brian R. Price (Hawaii Pacific University)
Published on H-War (June, 2016)
Commissioned by Margaret Sankey

Author: 
Robert Mandel
Reviewer: 
Jonathan Zartman

Zartman on Mandel, 'Global Security Upheaval: Armed Nonstate Groups Usurping State Stability Functions'


Robert Mandel. Global Security Upheaval: Armed Nonstate Groups Usurping State Stability Functions. Stanford Security Studies Series. Stanford: Stanford University Press, 2013. 304 pp. $110.00 (cloth), ISBN 978-0-8047-8497-9; $32.50 (paper), ISBN 978-0-8047-8498-6.

Reviewed by Jonathan Zartman (Air University, Air Command and Staff College)
Published on H-War (June, 2016)
Commissioned by Margaret Sankey

Author: 
David Stevenson
Reviewer: 
Edmund Potter

Potter on Stevenson, 'With Our Backs to the Wall: Victory and Defeat in 1918'


David Stevenson. With Our Backs to the Wall: Victory and Defeat in 1918. Cambridge: Belknap Press, 2011. Maps, tables. 752 pp. $35.00 (cloth), ISBN 978-0-674-06226-9.

Reviewed by Edmund Potter (Mary Baldwin College)
Published on H-War (June, 2016)
Commissioned by Margaret Sankey