Example of Newsletter

April 2006

Note: The links in this sample newsletter have been de-activated. It only serves to illustrate the content, especially the opt-out option, which back issues do not show.

In the April 2006 issue:

- Link to the free general relativity downloads of Relativity 4 Engineers.

- Gravity Probe B discussion and links.

- Progress report on Relativity 4 Engineers E-book.

Relativity 4 Engineers Downloads

Here is the link to the General Relativity downloads page of Relativity 4 Engineers: XXX. This link will be updated monthly, but only if there are updates to the mentioned page or to any of the pdf downloads.

Changes to the pdf downloads will be indicated in the downloads page itself. This is so that you can decide when it is time to download a file again.

Gravity Probe B

Gravity Probe B is a spacecraft in a polar orbit about 650 km above Earth, intended to measure the properties of space-time around Earth. The two effects that it is designed to measure are the "geodetic effect" and "inertial frame dragging".

The geodetic effect is caused directly by space-time curvature. A gyroscope in space 'leans over' into the slope of space-time. When moved around earth in one orbit, the spin axis will point in a slightly different direction than the direction it started from.

Inertial frame dragging or 'gravitomagnetism' is caused by any rotating mass, which tends to drag the close-by space-time around with it, somewhat like a ball spinning in liquid does with the liquid. This effect alters the spin axis of the gyroscope in a different direction than the geodetic effect (if the gyro is in a polar orbit). Gravity Probe B’s four gyroscopes were operating in "science mode" from about Sep 2004 to Sep 2005. The team is presently in a data analysis phase and the results are expected early in 2007.

You can read a lot more in the following links (amongst others):

Gravity Probe B

Standford Gravity Probe B

Relativity 4 Engineers E-book status

The e-book is presently in its final proofreading phase and at the same time the index is being built. This is a time-consuming exercise and the launch date, originally set for Sep 06, might or might not be improved - typical engineer-speak! So watch this space…

Many of the free downloads are chapters from the early versions of the e-book. The book will be continuously expanded with updates as new, engineering-relevant advances are made in relativity and cosmology.

The updates will most likely become available as free downloads on the website, with possibly re-releases of an updated e-book as required. All will be communicated in this newsletter.

Have a great engineering month!

Burt Jordaan

http://www.einsteins-theory-of-relativity-4engineers.com/ Home Page

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