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Tesla suffered from OCD
sranje   7/25/2014 2:18:17 PM
It is well documented that Nikola Tesla suffered from OCD (numbers, utensils when eating, etc.). OCD can be very easily controlled (ERP method) but -- left untreated it can mushroom completely out of control. An example is Howard Hughes whom reportedly personal physicians escallated into full insanity to grab his wealth. A blemish forever on Mormon church infrastructure which reportedly hugely benefited.

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Re: A little known problem with DC
Sheepdoll   7/25/2014 12:53:20 PM
SpeedEvil --The amount of current needed to magnetise, even when very close to a DC wire is really quite high.

The story actually came from a magazine for watch collectors.  I do not have a copy on hand so can not look up the actual reference.  Most of the article was on the effects the direct current had on watches, which are sensitive to small amounts of magnetism.  It could be that the pins were becoming magnetized.

Edison's system must have had high currents.  I think it ran about 80 or 90 volts.  There was a lot of line loss.  Reports also indicated that the ground returns in earth were actively charged. That walking over such could cause a tingling sensation. None of this was regulated, so practices in the 1880s may have been quite different than they are now.

Many of early electrical items were used for therapeutic purposes. See the film _Road to Wellville_ for examples.

My personal take on the corset story is that it is much like cellphone radiation exposure.  There was a propaganda war over which system was the least leathal.

Susan Rambo
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Susan Rambo   7/25/2014 12:17:08 PM
This is a charming, quick read about Tesla and Van Gogh; interesting premise. You could go back to school and use it for your thesis (if you are studying history). I didnt realize the mental health issues with Tesla. Has anyone read a good biography of Tesla they can recomment?

David Ashton
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Re: A little known problem with DC
David Ashton   7/25/2014 6:32:13 AM
@Sheepdoll...I never thought that I would be learning about the history of women's undergarments on EETimes!  But then I forgot, you're an "Active historical costumer" to quote your profile.  Thanks for the insights :-)

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Re: A little known problem with DC
SpeedEvil   7/25/2014 6:30:17 AM
This seems at best doubtful.

Yes, steel can be magnetised - but not very strongly.

The amount of current needed to magnetise, even when very close to a DC wire is really quite high.

Simply walking into a room lit by, or with a DC appliance will not do it.


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A little known problem with DC
Sheepdoll   7/25/2014 3:28:13 AM
Edison's DC actually changed what women wore.  Corsets in the 1880s used steel "bones" to form the hourglass curve. (actually they are needed for proper support of the bosom.)

DC current causes steel or iron moving through it to become magnetically polarized.  Since most of his installations were in upper class houses, this had the effect of magnetizing the corsets. 

Pins and other objects would stick to these society ladies mid sections.  About this time rubberized elastic was being developed, which allowed us to no longer need steel, whalebone or reeds for support.

Women everywhere have much to thank Tesla.




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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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