://www.hparchive.com/
DaveB, NZ
- Original Message -
From: "Stan Searing" <[EMAIL PROTECTED]>
To: "'Discussion of precise time and frequency measurement'"
Sent: Friday, July 14, 2006 6:04 AM
Subject: Re: [time-nuts] Interesting Patent
> Hi Dave and the re
of
standards, clocks and DVM's from the good old days.
Cheers,
Stan
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Dave Brown
Sent: Tuesday, May 16, 2006 2:32 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Inte
Hi...
I remember having seen an interesting analog
counter/frequency divider using charge pumps and
unijunction transistors in a watchmaker's mechanical
watch adjusting machine. ( i don't remember the
machine's name, but it is used to adjust the
oscillator's (balance wheel/hairspring) frequency.
Good suggestion Dave.
It would be nice just to see some of that gear again!
Of course, you need a darned good air conditioner if you are going to
use any of it.
John
At 05:31 PM 5/16/2006, you wrote:
>Looking to get good colour photos of some of these older HP counters
>(and similar offerings
>
>No, I have a HP 521C which comes with the HP 521A-59B crystal
>oscillator plugin
>module, but the HP 521A has it as an option. The HP 521C also have an
>additional counting row and an additional step in the timebase.
>Actually, you can supply it with an external time base of any of the
>freque
Looking to get good colour photos of some of these older HP counters
(and similar offerings from other manufacturers) in the pre/early
Nixie etc period.
If you have anything available would appreciate direct email of same.
Thanks
Dave Brown, NZ
--
No virus found in this outgoing message.
From: John Day <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Interesting Patent
Date: Tue, 16 May 2006 15:33:58 -0400
Message-ID: <[EMAIL PROTECTED]>
>
> >
> >Hmm... strange... these applications are no match for the Phantastron
> >divider,
> >which Frederi
>
>Hmm... strange... these applications are no match for the Phantastron divider,
>which Frederic Calland Williams invented in 1941. It did 1/5, 1/6 or 1/10 with
>a triode and a diode if memory serves me right. My oldest HP counter is
>virtually loaded with it, and it has a nice trimmer in the bac
Hi Scott:
I got burned by using the then free IBM patent data base as the basis of
all the links on my web pages. But when that got sold and became a
commercial operation all my links died, so now I only link to the USPTO
and have also learned that you can NOT just cut and paste URLs since
th
From: Brooke Clarke <[EMAIL PROTECTED]>
Subject: [time-nuts] Interesting Patent
Date: Tue, 16 May 2006 09:20:11 -0700
Message-ID: <[EMAIL PROTECTED]>
> Hi:
>
> I came across a 1946 patent for a vacuum tube based counter circuit that
> will divide 60 Hz down to 1 Hz.
Brooke Clarke wrote:
> Hi:
>
> I came across a 1946 patent for a vacuum tube based counter circuit that
> will divide 60 Hz down to 1 Hz. It's interesting in that there's a
> discussion about the advantage of using binary instead of base 10 and
> also about using feedback to change the scale
From: "Scott Newell" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, May 16, 2006 1:30 PM
Subject: Re: [time-nuts] Interesting Patent
> At 11:20 AM 5/16/2006 , Brooke Clarke wrote:
>>Hi:
>>
>>I came acros
At 11:20 AM 5/16/2006 , Brooke Clarke wrote:
>Hi:
>
>I came across a 1946 patent for a vacuum tube based counter circuit that
>will divide 60 Hz down to 1 Hz. It's interesting in that there's a
>discussion about the advantage of using binary instead of base 10 and
>also about using feedback to
Hi:
I came across a 1946 patent for a vacuum tube based counter circuit that
will divide 60 Hz down to 1 Hz. It's interesting in that there's a
discussion about the advantage of using binary instead of base 10 and
also about using feedback to change the scale of the counter from 64 to
60 (or
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