Greetings

I have NO experience with vacuum coating - but I would think that your
car cigarette lighter element would more likely be a nichrome type of
wire. From the Kanthal website it is rated to 1450 degrees C and
nichrome may be rated higher (but I doubt it) whereas tungsten is rated
at over 3400 degrees C - I know which one I would be using!

Darald

This is my first post to this list. Let's see if it works.

I have a vacuum chamber, which pulls needed vacuum for aluminizing,
so I am now at stage of needing to get electrodes into the stainless
steel chamber. James Learch already offered some ideas, and I was
hoping to see if there were others as well. I would be happy to
know of specific electrodes used and how they were inserted into
the chamber.

Along same line, anyone know if Tungsten is really required? Can I
now instead use something like Kanthal wire or perhaps a car cigarette
lighter heating element, etc? This seems more convenient.

I'll now wait and see if this gets distributed to the members.

Dominic-Luc Webb

--- Gomez <gomez@...> wrote:

On Friday, November 21, 2003, at 07:18 AM,
gjnelson@...
wrote:

I have scanned a copy of the article on

aluminising telescope mirrors

from amateur
telescope making book 3. It is a large 1.2 Mb

file. If anyone would

like me to email
them the pdf I am willing to do so.

Amigo Gomez:
I take your offert of the copy of the article on
aluminsing telescope mirrors.
I garantee you, it is for my personal use only.
Plese mail me the pdf.
Tanks you.

=====
Alberto Gasparini
Perito Moreno 1032
Godoy Cruz (5501)
Mendoza
ARGENTINA
telefono 0261-422-0923

__________________________________
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Free Pop-Up Blocker - Get it now

Well I have the 1397 running. Ran a few fluid changes through it to
displace the nasty old oil and water. Haven't plumbed it all
together but it sure appears to pull quite a bit of air.

Also received an order of tungsten boats and a new TC gauge.
Shouldn't be too long before I have it running.

-Bill

--- In VacuumX@..., "Ken Hunter" <atm_ken_hunter@y...>
wrote:

Good find! That 1397 will suck all the air out of a 10 inch diff

pump

in short order.. If you have a smaller diff pump it's overkill but
you'll sure be able to recycle quickly!

Ken Hunter

Good find! That 1397 will suck all the air out of a 10 inch diff pump
in short order.. If you have a smaller diff pump it's overkill but
you'll sure be able to recycle quickly!

Ken Hunter


--- In VacuumX@..., "arcstarter" <arcstarter@y...> wrote:

Guys,
I recently purchased a used (and abused) evaporator, and am in the
process of refurbing the same.

If anyone cares I can probably post pictures and more information
on the specific machine. Belljar is 12 inch diam 18 inches tall.
Dual tungsten/Moly boats. Used in production service for the
evaporation of nickel, silver, and gold for quartz crystal
construction.

Machine came w/o vacuum pumps but I have since located a Welch

1397

mechanical pump and a small diffusion pump.

-Bill

Guys,
I recently purchased a used (and abused) evaporator, and am in the
process of refurbing the same.

If anyone cares I can probably post pictures and more information
on the specific machine. Belljar is 12 inch diam 18 inches tall.
Dual tungsten/Moly boats. Used in production service for the
evaporation of nickel, silver, and gold for quartz crystal
construction.

Machine came w/o vacuum pumps but I have since located a Welch 1397
mechanical pump and a small diffusion pump.

-Bill

On Friday, November 21, 2003, at 07:18 AM, gjnelson@... wrote:

I have scanned a copy of the article on aluminising telescope mirrors from amateur
telescope making book 3. It is a large 1.2 Mb file. If anyone would like me to email
them the pdf I am willing to do so. Please note copyright does exist on this article and I
am only making this offer for people who do not have access to the original. I know
Willmann-Bell do still publish the full series and it would be better to buy the books. So
far as I understand making a copy of a limited amount of a published work is legal as
long as it is for personal use.

Somebody please correct me if I am wrong and I will retract the offer.

Not that I am a stickler for adhering to every single law (just some of them), but you seemed to want to know:

Generally speaking, copyright law allows you to make a copy of a work which you have purchased, for your own personal use. However, "personal use" does not include distributing copies to others.

Geoff,

Hi

I have scanned a copy of the article on aluminising telescope mirrors from amateur
telescope making book 3. It is a large 1.2 Mb file. If anyone would like me to email
them the pdf I am willing to do so. Please note copyright does exist on this article and I
am only making this offer for people who do not have access to the original. I know
Willmann-Bell do still publish the full series and it would be better to buy the books. So
far as I understand making a copy of a limited amount of a published work is legal as
long as it is for personal use.

Somebody please correct me if I am wrong and I will retract the offer.

Kind regards
Geoff

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-- 

Hi

I have scanned a copy of the article on aluminising telescope mirrors from amateur
telescope making book 3. It is a large 1.2 Mb file. If anyone would like me to email
them the pdf I am willing to do so. Please note copyright does exist on this article and I
am only making this offer for people who do not have access to the original. I know
Willmann-Bell do still publish the full series and it would be better to buy the books. So
far as I understand making a copy of a limited amount of a published work is legal as
long as it is for personal use.

Somebody please correct me if I am wrong and I will retract the offer.

Kind regards
Geoff

Hi

I have scanned a copy of the article on aluminising telescope mirrors from amateur
telescope making book 3. It is a large 1.2 Mb file. If anyone would like me to email
them the pdf I am willing to do so. Please note copyright does exist on this article and I
am only making this offer for people who do not have access to the original. I know
Willmann-Bell do still publish the full series and it would be better to buy the books. So
far as I understand making a copy of a limited amount of a published work is legal as
long as it is for personal use.

Somebody please correct me if I am wrong and I will retract the offer.

Kind regards
Geoff

Hi

I have scanned a copy of the article on aluminising telescope mirrors from amateur
telescope making book 3. It is a large 1.2 Mb file. If anyone would like me to email
them the pdf I am willing to do so. Please note copyright does exist on this article and I
am only making this offer for people who do not have access to the original. I know
Willmann-Bell do still publish the full series and it would be better to buy the books. So
far as I understand making a copy of a limited amount of a published work is legal as
long as it is for personal use.

Somebody please correct me if I am wrong and I will retract the offer.

Kind regards
Geoff

STOLEN:

A StarMaster 30" telescope w/ an Argo Navis DSC and a White 17'
Haulmark "V" nose, tandem wheel trailer which has a ramp rear door
and a 36" side door on the right. Items were taken from my residence
in Albuquerque, New Mexico in the early morning on Thursday, 13
November, 2003. Also included in the trailer was a Craftsman brand
tool cabinet that contained hand tools of approximately $1500 value,
and two 10 ft Tripod ladders (Louisville red fiberglass and Tallman
aluminum).

Any information on the whereabouts of these items would be greatly
appreciated. Please contact the Albuquerque Police Department. In
addition, the owner, Brock Parker can be reached at (505) 298-2792 or
E-mail starbadger203@y... or Additional Contact: Sammy Lockwood
(505) 275-0258 or E-mail brock@s...

Brock B. Parker AKA (a brokenhearted) starbadger
-----------------------------------------------------
Brock has registered his loss with Starmaster, Argo Navis, and
several other astronomically related sites. Our theory is that crack-
heads or similar low-life's stole the trailer without knowing it's
contents, and will likely either trash it's unusual contents, or
hopefully, try to sell it. Apparently, his insurance will not cover
this loss.

Obviously, the only hope to reclaim this scope is to get the word out
as far and wide as possible. There are only 6 scopes like this in
existence, so maybe we'll get lucky. I would ask that you forward
this note to any/all astronomical listservs and bbs's. Ff possible,
link to your post to www.taas.org/stolen_starmaster/, where a
picture and info are available.

If there is any good news here, it's that his 18" dob, and his
eyepiece case was not in the trailer.

Mr. Peter John Smith:
After looking your reprints of diffusion pumps, I can
see all of them have ejector as the last stage.
I wish to know where are the benefits of the ejector
system and also the problems it can bring.
Do you have a close drawing of the ejector, with
dimensions and critical details.
I am glad you are all ears, if anyone else has more
info on actual dimensions and construction of a diff
pump.
Thanks you.
Albert Gasparini

__________________________________
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Protect your identity with Yahoo! Mail AddressGuard

It would be an option but the transport cost to SA makes any option on ebay out of my
current budget. Otherwise I most likely would be in business now.

I was just going to run without valves. Good baffles and hope like hell the power does
not go out. I will switch off the pump let it cool and then let the atmosphere in. Cycle
time per item in the chamber will be longer but it is the only current option with out
spending more money than I have.

Geoff

Has anyone used it? In their latest paper catalog, which arrived in the mail yesterday, Duniway claims that it has higher oxidization resistance, higher operating temperature limits, and lower vapor pressure at elevated temperatures than any other DP (diff. pump) fluid, including the exotic silicones such as Fomblin. They claim you can even expose the DP to atmosphere (they did it repeatedly in tests) without harm to fluid or pump. (!) They claim its back-streaming rate is so low that in most applications, a cold trap is not necessary. (!)

All of this seems too good to be true, but if true, it's a wonder product.

So, has anyone used it? It's hideously expensive, $130 for 100cc's, which puts it in the same class as the exotic silicone DP fluids, but if all their claims are true, it would be worth it.

- Bill "Gomez" Lemieux

.........................
186,000 miles per second.
It's not a good idea,
it's just the law.

Geoff,

Peter John Smith put a picture on his website of the internal construction of a vacuum
pump. It has helped but I don't think I understand and the drawing is not clear enough. I
also had a really good look at the picture of the glass pump. Please correct me if I am
using incorrect terminology.

Now for the questions.

How critical are the tolerances of the jet openings? The glass pump seems to have
quite big openings. Are the angles exceptionally critical? perpendicular will not work. I
assume that the angle has to be in the direction of flow as much as possible

How is the oil kept out of the pipe to the roughing pump? Or possibly a better question
is; how is the internal connection to the roughing pump normally made? The rough
drawing that the glass blower showed me had a collection chamber fed by a pipe to the
vaporisation chamber that sat below it. The glass pump picture just shows a pipe
exiting the chamber with possibly a connection to the lowest jet.

How does a fractionating pump work. Is it just the height of the assembly as is normally
done with fractional distillation? Which means any pump with jets at different heights
will be a fractionating pump.

Does the whole jet assembly fit in the body loosely or is it secured in?

Are each of the jets fed separately or are all the jets fed from the same tube? The glass
pump seems as if all are fed separately but the pump Peter John Smith showed seems
to have one tube. Is this the difference between a fractionating and non fractionating
pump?

I am sure I will think of some more questions to ask but I'll give you guys a break for
now.

Thanks

Geoff

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开云体育

Peter John Smith put a picture on his website of the internal construction of a vacuum
pump. It has helped but I don't think I understand and the drawing is not clear enough. I
also had a really good look at the picture of the glass pump. Please correct me if I am
using incorrect terminology.

Now for the questions.

How critical are the tolerances of the jet openings? The glass pump seems to have
quite big openings. Are the angles exceptionally critical? perpendicular will not work. I
assume that the angle has to be in the direction of flow as much as possible

How is the oil kept out of the pipe to the roughing pump? Or possibly a better question
is; how is the internal connection to the roughing pump normally made? The rough
drawing that the glass blower showed me had a collection chamber fed by a pipe to the
vaporisation chamber that sat below it. The glass pump picture just shows a pipe
exiting the chamber with possibly a connection to the lowest jet.

How does a fractionating pump work. Is it just the height of the assembly as is normally
done with fractional distillation? Which means any pump with jets at different heights
will be a fractionating pump.

Does the whole jet assembly fit in the body loosely or is it secured in?

Are each of the jets fed separately or are all the jets fed from the same tube? The glass
pump seems as if all are fed separately but the pump Peter John Smith showed seems
to have one tube. Is this the difference between a fractionating and non fractionating
pump?

I am sure I will think of some more questions to ask but I'll give you guys a break for
now.

Thanks

Geoff

On Monday, November 10, 2003, at 11:17 AM, nano_tronics wrote:

OK found it :)

The web site for this publication (The Bell Jar) can be found here:


You can even buy printed back-issue collections.