The Gray Ship: Book One in The Time Magnet Series

After reading it, I now have a new appreciation for the risks of placing a powerful magnet anywhere near a knife, too! Comprehension, Compensation and Computation. Could you please help me. There is a good website to find the magnetic variation sometimes called magnetic deviation as in this website for any location in the world:. If you select South Africa as the country and enter Nelspruit as the city, you get a display where the magnetic declination is given as 18 degrees 5 minutes West. Here we find that true North is 18 degrees 5 minutes or I set the compass here in Brazil.

He knew the equations, but had no knowledge of the authors. Enjoyed reading the contributions of Matthew Flinders; Archibald Smith, Edmund Halley, but I wonder also about the contribution of Peter Barlow compensation for the compass of ships. Here is a link to his book from describing his work, which is quite impressive mathematically: Barlow should have been included in the essay, as he was an important figure.

If I have the time to update the essay, I will certainly correct that omission. Thank you for taking the time to comment here—these kinds of contributions from informed readers are what I enjoy most about the blog! Satellite navigation in the 18th century. Thanks for your question. I have not seen a formula for the effect of elevation on magnetic declination angle. I would assume it would be very small for any ground location compared to any local effects from minerals in a mountain or such, since the earth is so huge compared to elevation differences on its surface.

If I understand correctly only a magnet will be pulled or pushed or turned by a magnetic field, and a compass needle needs to be magnetised in order to align itself with the earths magnetic field. Likewise a piece of un-magnetised iron will only be noticeably affected by a permanent magnet when the magnet is close enough to the iron to induce enough magnetism that the iron becomes a temporary magnet and responds to the field of the magnet.

Have I got this right? The surprising thing to me is how much of an effect the relatively weak magnetic field of the earth has on a large enough piece of iron. Please feel free to continue this discussion. My Personal Website is at www. Please visit and participate here. Also, you can click on the Contact Me link below to submit any questions or ideas for new topics.

Powered by WordPress , Mandigo theme by tom. The Sources of Compass Error Assuming they are constructed well, compasses on ships fail to point to true geographic north due to two factors: Magnetic Variation Magnetic variation has been known from voyages since the early s at least. Magnetic Deviation There is an additional effect on the compass needle that took much longer to appreciate and even longer to understand.

The relationships of the terms in the second equation to those in the first are: In essence magnetic deviation has the following components: Other Sources of Magnetic Deviation There is another effect not taken into account in this chart, the distortion due to heeling of the ship, i. Ascertaining Ship Parameters The measurement of the magnetic deviation parameters for each compass location on a given ship was a tedious job that prompted many proposals for the best method.

A is the mean of the algebraic sum of all the deviations B is the mean of deviation at E and the negative of the deviation at W C is the mean of the deviation at N and the negative of the deviation at S D is the mean of the deviations at NE and SW and the negatives of the deviations at SE and NW E is the mean of the deviations at N and S and the negatives of the deviations at E and W For any more than 8 rhumbs the derivation of the parameters is very complicated and involves solving a complex system of equations developed by Archibald Smith and others.

Compensating for the Magnetic Deviation The magnetic deviation of a ship is typically corrected, even today, by components located in the binnacle holding the compass.

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It has lost them before it has appreciated that they were in the way of being lost; and when I say 'its treasures' I mean the special discoveries and crafts of mankind. This journal attempts to capture in brief essays my encounters with the technically elegant but nearly forgotten in the mathematical sciences--artistically creative works that can take our breath away with their brilliance.

Please click on the About link above for more details. I have a backlog of material to write about here, so keep in touch. April 19th, at 1: December 10th, at 4: July 21st, at July 22nd, at November 11th, at 4: Elevation — m Thanking you Thomas Barry There is a good website to find the magnetic variation sometimes called magnetic deviation as in this website for any location in the world: January 18th, at April 27th, at 8: August 26th, at 5: October 3rd, at 8: Enter your mobile number or email address below and we'll send you a link to download the free Kindle App.

Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required. To get the free app, enter your mobile phone number. Would you like to tell us about a lower price? While steaming toward Charleston, South Carolina in April , the ship encounters a time warp or wormhole.

Suddenly, Captain Patterson and her crewmembers find themselves in the year , just before the start of the Civil War. Abraham Lincoln wants to win the war, and he sees this ship as a key to victory. But Captain Patterson and crew want to return to the 21st Century.

For them, the Civil War was history. Now, they find that it has only just begun. Does she risk mutiny, or commit treason? If she changes history, what will the future look like?

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The Thanksgiving Gang Jack Thurber has traveled through time — again. This was his fourth journey through time, earning him a nickname The Time Magnet. But this time he's traveled into the future. He discovers that he and his wife Ashley were killed in a terrorist nuclear attack on Ashley's ship on Thanksgiving Day, , in what became known as the Thanksgiving Attacks.

Jack's got to find a way back to the past, the past when he and Ashley were still alive. To do that he forms a group of people to help him. They call themselves The Thanksgiving Gang. Dare he change history? Rip-roaring, gut-wrenching suspense wrapped in a story of friendship and courage. A Time of Fear In a month, five American cities will be devastated by suitcase nuclear bombs.

The time travelers take on their old name, The Thanksgiving Gang. They know what will happen, because they travelled to the future.

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They know what the result will be. They know the details. Five American Cities targeted by nuclear suitcase bombs. BUT they don't know where the bombs are — and they don't know how to find them. The clock is ticking and millions will soon lose their lives — unless they find the bombs. A Time of Fear will grip you and not let go, even after you finish the book. They have a duty — to warn the authorities of the coming war.

They also have a duty to themselves. They want to return to their home, their home in Their plane had a cockpit data recorder, a Black Box, which would give them the coordinates to find the wormhole and return home. Will they have to restart their lives from and never return home? Or will they find a way to read the secrets of the box? Read more Read less. Thousands of books are eligible, including current and former best sellers. Throw in a young, capable, female African-American captain, and the plate of possibilities is overflowing.

Where 'The Gray Ship' deviates from other past-time travel stories is that it develops a cohesive plot that not only stands the test of credibility in its 'past' events but offers a closing future that mates well with the inescapable changes wrought in the 'new' past. The book is a brisk read with a satisfying momentum drawing readers forward through its pages with as much efficiency as the book's worm-hole draws the titular ship back in time.

Spiced with some intrigue aboard the ship, a few action sequences and a budding romance, readers should be satisfied on all fronts, and can certainly walk away with at least one dinner conversation of alternate futures. Jan 14, Steven Daniel rated it it was amazing.

What if you could change a gruesome part of American history? Captain Ashley Patterson of the Navy and her crew did just that. Captain Ashley Patterson and her Naval battleship find themselves navigating through a wormhole and then transported to the year , a couple of days from the start of the American Civil War. Ashley encounters iconic political figures such as Abraham Lincoln.

The Gray Ship had everything you would want in a spectacular novel, a thriller that had me on the edge of my seat What if you could change a gruesome part of American history? The Gray Ship had everything you would want in a spectacular novel, a thriller that had me on the edge of my seat. The Gray Ship introduced me into an incredible genre that I now find amazing.

I would love to see a movie adaptation of The Gray Ship. I recommend The Gray Ship to any reader who enjoys the alternate history genre. I will be looking forward to reading the next book in the Time Magnet series. Jan 02, Kirkus rated it did not like it. I liked the wrapup at the end though and that the story in the present continue. The cover was also nice. The authors view on females are extremely dated though, normal readers will cringe several times. Lets say we have a woman president holding the original constitution in her hands and she suddenly sees some pink frills. All women including our female president would then throw the constitution out the window and run up to the pink frills panting and exclaiming how wonderful they are.

This is how women are, they just cant help it. Its hard not to gape at the author for his views on females.

The Gray Ship

Mar 27, Pascal rated it did not like it Shelves: The idea behind this book is interesting if not very original but that all there is to it. The writing is generally bad, uneven and sometimes plain wrong. The characters are childish, cardboardy and not very well thought out.

It's like this was written by a really immature 14 years old who's not very good at English I gave it 15 chapters, which is not a lot considering that a chapter is 4 pages long on average on my reader, and just gave up. It's just too stupid for my taste. Moran is jus The idea behind this book is interesting if not very original but that all there is to it. Moran is just a really bad writer who's unfortunately is quite representative of modern "S. Don't waste your time and money and give it a pass. It's not worth it even if you get it free. Oct 13, Brandon rated it it was amazing.

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I really, really enjoyed this book. I loved the concept, I loved the story, and I loved the twists. The way the author introduced each character was fantastic, especially Seaman Jack! I do think that the author should go through an editor, as there were some grammar errors and continuity errors throughout the book, but I would still recommend this book to any Sci-Fi fan out there.

Mar 17, yoksan marked it as gave-up. Reminded me too much of "Zipang". The main plot is the same: Ship from the future went back in time and the captain had to decide if they'd join in the war. The crew broke down into two groups; one for war and one against war. Someone knew about the ship with super advanced technology, and decided they need the ship in order to win the war. Who knows, maybe there's something different between the two. I'll read the book later.

Good characterizations, some plot twists, and I enjoyed the ending to a point , but I won't spoil it for you. This is the author's first fictional effort, and it's a good one. A couple of the characters weren't completely realistic, but it is fiction, and if you buy the premise, and realize that it's a first novel, that is a very minor problem.

Jan 26, Dan Moskovitz rated it really liked it. The story is fun and the book is an easy read. Some of the characters are a little too transparent and their motivations a bit obvious but I enjoyed it. I'll read the next in the series. It's a good escape. Nov 24, Tiffany rated it really liked it Shelves: