Re: Deane Kidd and the Metric System

Ian Newman <ian_new@...>

Hi,
On the topic of conversion between Imperial and SI units of length there is a well known method of quickly converting aliquot parts of an inch to millimetres using the approximation 254 = 256

If you have a fractional inch dimension, multiply top and bottom of the fraction by two repeatedly until the denominator equals 256.Â  Shift the decimal point of top and bottom one place to the left.Â  The numerator now equals the inch dimension times 25.6, which is the equivalent number of millimetres (to less than 1% error)

For example, take a fractional inch dimension - 3/8

3/8 = 6/16
3/8 = 12/32
3/8 = 24/64
3/8 = 48/128
3/8 = 96/256

3/8 inch = 9.6mm (to better than 1%)
Actual conversion = 9.525mm

In actual use, simply count how many times you need to multiply the denominator to get 256, then multiply the numerator by two that many times and write down the answer, slipping in the decimal point as you do so.

E.g. 9/16
Multiply the denominator by 2 four times (32, 64, 128, 256).Â  Now multiply the numerator by 2 four times - 18, 36, 72, 144 - giving 14.4mm (actual value 14.29 to four sig. fig.)

If you have whole numbers of inches, convert to irrational fractions first:
2 3/4 inch = ((2 x 4) +3)/4 inch
=11/4 inch
= 704/256
= 70.4mm (actual value 69.85)

You can improve the accuracy (using mental arithmetic) by reducing the value of the answer by 1%. Take the first significant digit of the result, move the point two places left (divide by 100) and subtract from the original result.

Doing this to the examples above gives:

3/8 inch = 9.6mm
Better approximation:
3/8 = 9.6 - 0.09
= 9.51mm
Actual value = 9.525mm

9/16 inch = 14.4mm
Better approximation:
9/16 = 14.4 - 0.1
= 14.3mm
Actual value = 14.29mm

2 3/4 inch = 70.4mm
Better approximation:
2 3/4 = 70.4 - 0.7
= 69.7mm
Actual value = 69.85mm

Even I can multiply by two in my head......

All the best,
Ian

From: "Barry n4buq@knology.net [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Thursday, 14 December 2017, 13:47
Subject: Re: [TekScopes] Deane Kidd and the Metric System

Â  Instead of a ruler for size comparison, perhaps Walter can post pictures of those knobs alongside an assortment of coins from all around the world? :)

Thanks,
Barry - N4BUQ

| | Virus-free. www.avg.com |

[Non-text portions of this message have been removed]

NigelP

On further investigation this is vertical bounce due to ALT mode being invoked either on the plug-in or the mainframe when lowish scan rates are used. I didn't see anything about this matter in the manual; I wonder if there is a supply decoupling problem somewhere?

Regards

Nigel

Re: Deane Kidd and the Metric System

Harvey White

On Thu, 14 Dec 2017 17:24:26 +0000 (UTC), you wrote:

The Spanish dubloon, IIRC, had score marks on it which allowed it to
be easily broken into eighths. These were known as bits.

That we still retain the language of....

Harvey

"Life is a carnival, believe it or not.Ã¯Â¿Â½ Ã¯Â¿Â½Life is a carnival, two bits a shot..."
Ã¯Â¿Â½ Ã¯Â¿Â½ Ã¯Â¿Â½ Ã¯Â¿Â½ Ã¯Â¿Â½ Ã¯Â¿Â½ Ã¯Â¿Â½ Ã¯Â¿Â½ Ã¯Â¿Â½(The Band, "Life is a Carnival" - arguably the greatest example of Americana Folk Rock, ignoring the fact that most of them were Canadian)
Ã¯Â¿Â½ Dan

On Wednesday, December 13, 2017, 9:04:21 AM EST, Barry n4buq@knology.net [TekScopes] <TekScopes@yahoogroups.com> wrote:

Ã¯Â¿Â½
The U.S. used to have a 1/8 dollar designation as a "bit". Two bits equals a quarter and is still sometimes heard amongst the older folks.

Thanks,
Barry - N4BUQ

Re: Deane Kidd and the Metric System

Geoffrey Thomas

On 14/12/2017 18:09, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
Inflation is a symptom; I'm more worried about the causes.
Austin Mitchell made sage observations in The Guardian on the 11th.
Even that prominent Brexiteer, John Redwood MP, advises his clients
to get their money out of the UK.
But that's too close to politics for comfort, in this group.
You're talking about THE John Redwood, arch ventriloquist and darling of linguists everywhere...

Geoff.

Re: Was: Deane Kidd and the Metric System, now nothing to do with it

Craig Sawyers <c.sawyers@...>

Craig

-----Original Message-----
From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com]
Sent: 14 December 2017 19:11
To: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] Deane Kidd and the Metric System

Ooh, did they upgrade the trolleys with the new pound ?

Sent from my iPhone

On 14 Dec 2017, at 17:48, Tom Gardner tggzzz@gmail.com [TekScopes]
<TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

------------------------------------
------------------------------------

------------------------------------

Re: Tektronix 2213a manual with single page schematic diagrams

On Thu, 14 Dec 2017 13:33:18 -0600, you wrote:

The manual for the 2215A can be used for everything on the 2213A
except timebase B circuits.

I do not have the 2213A schematic however I uploaded some cleaned up
2215A schematics that I compiled. Thank Yahoo if their provided URL
does not work. If that is a problem, then I can upload them somewhere
else.

Now hosted at Tekwiki as well thanks to Kurt.

<http://w140.com/tekwiki/images/c/c4/Tek_2215A_Schematics_11x17.pdf>

Re: Deane Kidd and the Metric System

Tam Hanna

With all military respect, but this is bullshit.

Inflation is a symptom; I'm more worried about the causes.

Inflation is not a symptom. Inflation is a byproduct of a fiat currency and a political system. If money can be debased, it will be debased to fund "gibs me dat" programs.

--

With best regards
Tam Hanna
---

NEW: Enjoy electronics? Like seeing oscilloscopes get repaired? Please subscribe to my new YouTube channel -> http://www.youtube.com/user/MrTamhan

Re: c-12 camera

Bruce Griffiths

There's a wide range of lenses intended for industrial cameras available.

One of these should be suitable.

Edmund optics have a large number of such lenses.

You could also look on the Schneider Kreuznach website.

Some of these appear on ebay from time to time.

Bruce

On 15 December 2017 at 02:11 "Scott McGrath scott@mcscott.net [TekScopes]" <TekScopes@yahoogroups.com> wrote:

For those of us who are large format photographers as well as engineers many of us stocked up on polaroid 4x5 film because it had many unique qualities.

And it was expensive (3-4 dollars sheet) when it was last being produced by Polaroid

The New55 film is on par with the old Polaroid pricing. You can buy the upgraded 4x5 holders from the project or send yours in for an upgrade. The old 545 holders did have some nagging issues which the New55 people have corrected

As for use by 'hipsters' no not quite as large format photography requires considerable technical skill to even get a usable image. And it requires a large rigid tripod and patience and the ability to use a exposure meter intelligently, for advanced practitioners use of the 'Zone System' is common

None of those things are in the hipster wheelhouse.

What I've thought of doing is modifying a cooled astronomical camera for use in capturing single shot images from 7104. Has the high sensitivity required and is designed for flat field imaging, optics will be tricky though

[Non-text portions of this message have been removed]

Re: Deane Kidd and the Metric System

Colin Herbert

Oh, dear. I think I should probably offer an apology for mentioning Deane and the metric system in conjunction with Walterâ€™s knob project. What I thought was simply a wake-up call about the design dimensions of Tek knobs has gone so far off-topic, even if interesting to many.

How many Tek scopes can you get in a supermarket shopping-trolley? (Thatâ€™s a rhetorical question).

Colin.

From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com]
Sent: 14 December 2017 19:26
To: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] Deane Kidd and the Metric System

Not around here they didn't ;-) Still, the Heart Foundation sell a token to go on your keyring that is the correct size! Works a treat :-)

Dave

Ooh, did they upgrade the trolleys with the new pound ?

Sent from my iPhone

On 14 Dec 2017, at 17:48, Tom Gardner tggzzz@gmail.com <mailto:tggzzz@gmail.com%3cmailto:tggzzz@gmail.com> <mailto:tggzzz@gmail.com> [TekScopes] <TekScopes@yahoogroups.com><mailto:TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com <mailto:james.r.bart@gmail.com%3cmailto:james.r.bart@gmail.com> <mailto:james.r.bart@gmail.com> [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com <mailto:tggzzz@gmail.com%3cmailto:tggzzz@gmail.com> <mailto:tggzzz@gmail.com> [TekScopes] <
TekScopes@yahoogroups.com <mailto:TekScopes@yahoogroups.com%3cmailto:TekScopes@yahoogroups.com> <mailto:TekScopes@yahoogroups.com>> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com <mailto:john@ecosensory.com%3cmailto:john@ecosensory.com> <mailto:john@ecosensory.com> [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com <mailto:tggzzz@gmail.com%3cmailto:tggzzz@gmail.com> <mailto:tggzzz@gmail.com> [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)
[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Re: Tektronix 2213a manual with single page schematic diagrams

george edmonds

Artek list them

Re: Tektronix 2213a manual with single page schematic diagrams

On 13 Dec 2017 21:17:13 +0000, you wrote:

I want to work on my 2213a and I need schematics.

Searching online I found this document available from many websites:

http://w140.com/tektronix_2213_service.pdf http://w140.com/tektronix_2213_service.pdf
The 2213 is significantly different from the 2213A. They are
practically different series.

The problem with this document is that all of the fold outs (i.e. schematics and diagrams) are split among multiple pages. This makes it very difficult to view. I tried to print out the pages to put them together, but they do not fit together well.

Does anyone know where I can get the schematics on a single page apart from buying the paper manual on ebay?
The manual for the 2215A can be used for everything on the 2213A
except timebase B circuits.

I do not have the 2213A schematic however I uploaded some cleaned up
2215A schematics that I compiled. Thank Yahoo if their provided URL
does not work. If that is a problem, then I can upload them somewhere
else.

Re: Deane Kidd and the Metric System

David Slipper

Not around here they didn't ;-) Still, the Heart Foundation sell a token to go on your keyring that is the correct size! Works a treat :-)

Dave

Ooh, did they upgrade the trolleys with the new pound ?

Sent from my iPhone

On 14 Dec 2017, at 17:48, Tom Gardner tggzzz@gmail.com<mailto:tggzzz@gmail.com> [TekScopes] <TekScopes@yahoogroups.com><mailto:TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com<mailto:james.r.bart@gmail.com> [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com<mailto:tggzzz@gmail.com> [TekScopes] <
TekScopes@yahoogroups.com<mailto:TekScopes@yahoogroups.com>> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com<mailto:john@ecosensory.com> [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com<mailto:tggzzz@gmail.com> [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

Re: Deane Kidd and the Metric System

Ooh, did they upgrade the trolleys with the new pound ?

Sent from my iPhone

On 14 Dec 2017, at 17:48, Tom Gardner tggzzz@gmail.com [TekScopes] <TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

[Non-text portions of this message have been removed]

Re: Deane Kidd and the Metric System

James R. Bartlett

Amen

On 14 December 2017 at 18:09, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

Inflation is a symptom; I'm more worried about the causes.

Austin Mitchell made sage observations in The Guardian on the 11th.
Even that prominent Brexiteer, John Redwood MP, advises his clients
to get their money out of the UK.

But that's too close to politics for comfort, in this group.

On 14/12/17 18:01, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes]
wrote:

The way inflation is going we will be glad of anything
that we can spend

Jim

On 14 December 2017 at 17:48, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com
[TekScopes]
wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com
[TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes]
wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes]
wrote:
The UK still mints several unusual coins which - importantly -
can
be used in supermarkets.
You mean the current exchange rate on them is honored by
supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

[Non-text portions of this message have been removed]

Re: Deane Kidd and the Metric System

Tom Gardner

Inflation is a symptom; I'm more worried about the causes.

Austin Mitchell made sage observations in The Guardian on the 11th.
Even that prominent Brexiteer, John Redwood MP, advises his clients
to get their money out of the UK.

But that's too close to politics for comfort, in this group.

On 14/12/17 18:01, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes] wrote:

The way inflation is going we will be glad of anything
that we can spend

Jim

On 14 December 2017 at 17:48, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes]
wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes]
wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes]
wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by
supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

Re: Deane Kidd and the Metric System

James R. Bartlett

The way inflation is going we will be glad of anything
that we can spend

Jim

On 14 December 2017 at 17:48, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes]
wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes]
wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes]
wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by
supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

[Non-text portions of this message have been removed]

Old ioTech software...

Sergey Kubushyn

Just a shot in the dark -- does anybody have the old DOS Analyst488 software
for IOTech Analyzer 488 GPIB Bus Analyzer?

IOTech had been acquired by NI so there is almost no chance those guys saved
any of legacy IOTech software or they would give it up for free (or cheap)
even if they did. I'm trying to contact them to have all bases covered but
that is almost certainly useless.

User manuals are available but no signs of software anywhere in the Net...

---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************

Re: Deane Kidd and the Metric System

Tom Gardner

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

Re: Deane Kidd and the Metric System

Tom Gardner

I'm surprised at that.

Here our notes/coins change regularly, usually in response to improved
counterfeits). However, the Bank of England will exchange any note that
it has ever produced. That's the "I promise to pay the bearer on demand
the sum of X pounds" that is printed on each note.

In practice branches of banks will also accept "old" currency for a
substantial period after it is withdrawn from circulation. The last time
that happened, a couple of months ago, some shops also accepted
withdrawn coins for a month.

On 14/12/17 17:36, `Richard Knoppow dickburk@ix.netcom.com [TekScopes] wrote:
I grew up using the metric system for anything technical, for
instance, photographic processing formulas, but with Engnish measure for
daily life. I suppose if the U.S. ever went to metric completely I would
get used to distances in kilometers, etc.
The below reminds me of a detective/adventure story I read long ago.
You may know that in 1929 the United States changed its paper money. The
new money was of uniform size and smaller than before. People had a
grace period to turn in old bills for the new ones. The story has to do
with a criminal who gets out of prison after twenty years. He is
supposed to have a fortune stashed away somewhere that he would never
talk about. Several people go after him to get the stash. Eventually
someone tracks it down and kills him. It turns out to be "old" money and
worthless.

On 12/14/2017 8:57 AM, 'Colin Herbert' colingherbert@blueyonder.co.uk
[TekScopes] wrote:
I suppose they could be used anywhere, including supermarkets, so long as
they are recognised as "legal tender". Of course, the supermarket may not
recognise them and refuse to take them (this happens with Scottish
banknotes
in England, despite them being legal tender). It is probably better to
change then at a bank, or even better, keep them somewhere safe as a
collector's item - they will surely increase in collector's value as time
marches on.
I believe the Coronation and Churchill's Funeral crowns (initially 5
shillings, and usually kept in a plastic presentation box) are good
examples
of these collector's items/investments.
Colin.

-----Original Message-----
From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com]
Sent: 14 December 2017 16:46
To: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] Deane Kidd and the Metric System

On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can be
used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?

Re: Deane Kidd and the Metric System

James R. Bartlett

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

------------------------------------

------------------------------------

------------------------------------