I have a rotary rectifier used on a very early x-ray machine and it's a
large unit. The disk is about 2-ft in diameter. I'm guessing some where
around 1900? charles
On Thu, Apr 9, 2015 at 10:09 AM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
> On 4/9/15 5:30 AM, David wrote:
>
>> Hello List - The Sync Rotary Gap is truly a marvel of modern technology
>> :) and am amazed by how well it does what it does.
>>
>
>
> My big question to you long timers of the list. Who invented this
>> device? Who do we owe credit to for doing the original work on this
>> "Thing"?
>>
>
>
>
> Rotary sync gaps have been around for probably a century or more: as long
> as there has been AC to synchronize with.
>
> Rotary gaps in general are even older.
>
> Back before vacuum tubes, radio transmitters often used rotary gaps. If
> you're a ham, and know about RST (as in "UR 599, PSE RPT ALL"), the "tone"
> originally referred to the audio modulation of the signal from the rotary
> gap used in the transmitter, and part of knowing who was transmitting was
> recognizing the unique rise and fall of the tone as the rotary gap speed
> changed (from changes in the supply voltage, for instance).
>
>
>
> Rotary gaps were widely used as radar modulators as late as WW 2. the
> "rad lab" series of books from Lincoln Labs has design information.
> http://web.mit.edu/klund/www/weblatex/node7.html
>
> http://www.febo.com/pages/docs/RadLab/
>
>
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