Empathy List Archives

DD

Dr. David Kirkby

Mon, Jul 22, 2019 6:16 PM

I have been discussing with some friends about the Oxford Bell with a view
to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend the
ball. I thought of nylon fishing like, but can anyone think of a better
insulator? Obviously PTFE is a good insulator, but it’s not exactly
flexible. Nor is sapphire.

Dave

Dr. David Kirkby,

I have been discussing with some friends about the Oxford Bell with a view to making one. One guy can not believe a battery can last 175 years. Anyway, I was wondering what would make a good insulator to suspend the ball. I thought of nylon fishing like, but can anyone think of a better insulator? Obviously PTFE is a good insulator, but it’s not exactly flexible. Nor is sapphire. Dave -- Dr. David Kirkby,

AG

Adrian Godwin

Mon, Jul 22, 2019 7:40 PM

Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible when
thin - eg PTFE sleeving. Some of the other artificial fibres such as
dacron, kynar etc. might also be good - I'm not sure of their electrical
properties.

On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby <
drkirkby@kirkbymicrowave.co.uk> wrote:

I have been discussing with some friends about the Oxford Bell with a view
to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend the
ball. I thought of nylon fishing like, but can anyone think of a better
insulator? Obviously PTFE is a good insulator, but it’s not exactly
flexible. Nor is sapphire.

Dave

Dr. David Kirkby,

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.

Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible when thin - eg PTFE sleeving. Some of the other artificial fibres such as dacron, kynar etc. might also be good - I'm not sure of their electrical properties. On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby < drkirkby@kirkbymicrowave.co.uk> wrote: > I have been discussing with some friends about the Oxford Bell with a view > to making one. One guy can not believe a battery can last 175 years. > > Anyway, I was wondering what would make a good insulator to suspend the > ball. I thought of nylon fishing like, but can anyone think of a better > insulator? Obviously PTFE is a good insulator, but it’s not exactly > flexible. Nor is sapphire. > > Dave > -- > Dr. David Kirkby, > _______________________________________________ > volt-nuts mailing list -- volt-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > and follow the instructions there. >

RK

Rob Klein

Mon, Jul 22, 2019 8:02 PM

We can be fairly certain that materials like Nylon and PTFE were not around when the original bell was made ...

Someting like (waxed) silk, perhaps?

⁣Met vriendelijke groet,
Rob Klein

verstuurd vanaf mijn smartphone

Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin artgodwin@gmail.com schreef:

Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible
when
thin - eg PTFE sleeving. Some of the other artificial fibres such as
dacron, kynar etc. might also be good - I'm not sure of their
electrical
properties.

On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby <
drkirkby@kirkbymicrowave.co.uk> wrote:

I have been discussing with some friends about the Oxford Bell with a

view

to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend

the

ball. I thought of nylon fishing like, but can anyone think of a

better

insulator? Obviously PTFE is a good insulator, but it’s not exactly
flexible. Nor is sapphire.

Dave

Dr. David Kirkby,

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.

We can be fairly certain that materials like Nylon and PTFE were not around when the original bell was made ... Someting like (waxed) silk, perhaps? ⁣Met vriendelijke groet, Rob Klein verstuurd vanaf mijn smartphone Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin <artgodwin@gmail.com> schreef: >Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible >when >thin - eg PTFE sleeving. Some of the other artificial fibres such as >dacron, kynar etc. might also be good - I'm not sure of their >electrical >properties. > > >On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby < >drkirkby@kirkbymicrowave.co.uk> wrote: > >> I have been discussing with some friends about the Oxford Bell with a >view >> to making one. One guy can not believe a battery can last 175 years. >> >> Anyway, I was wondering what would make a good insulator to suspend >the >> ball. I thought of nylon fishing like, but can anyone think of a >better >> insulator? Obviously PTFE is a good insulator, but it’s not exactly >> flexible. Nor is sapphire. >> >> Dave >> -- >> Dr. David Kirkby, >> _______________________________________________ >> volt-nuts mailing list -- volt-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com >> and follow the instructions there. >> >_______________________________________________ >volt-nuts mailing list -- volt-nuts@lists.febo.com >To unsubscribe, go to >http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com >and follow the instructions there.

JW

Jason Watson

Mon, Jul 22, 2019 8:34 PM

Maybe flourocarbon (PVDF) fishing line? I'm interested if you are planning
to try to replicate the original dry pile or have something else in mind.

On Mon, Jul 22, 2019, 4:03 PM Rob Klein rob.klein@smalldesign.nl wrote:

We can be fairly certain that materials like Nylon and PTFE were not
around when the original bell was made ...

Someting like (waxed) silk, perhaps?

⁣Met vriendelijke groet,
Rob Klein

verstuurd vanaf mijn smartphone

Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin artgodwin@gmail.com
schreef:

Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible
when
thin - eg PTFE sleeving. Some of the other artificial fibres such as
dacron, kynar etc. might also be good - I'm not sure of their
electrical
properties.

On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby <
drkirkby@kirkbymicrowave.co.uk> wrote:

I have been discussing with some friends about the Oxford Bell with a

view

to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend

the

ball. I thought of nylon fishing like, but can anyone think of a

better

insulator? Obviously PTFE is a good insulator, but it’s not exactly
flexible. Nor is sapphire.

Dave

Dr. David Kirkby,

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.

Maybe flourocarbon (PVDF) fishing line? I'm interested if you are planning to try to replicate the original dry pile or have something else in mind. On Mon, Jul 22, 2019, 4:03 PM Rob Klein <rob.klein@smalldesign.nl> wrote: > We can be fairly certain that materials like Nylon and PTFE were not > around when the original bell was made ... > > Someting like (waxed) silk, perhaps? > > > ⁣Met vriendelijke groet, > Rob Klein > > verstuurd vanaf mijn smartphone > > Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin <artgodwin@gmail.com> > schreef: > >Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible > >when > >thin - eg PTFE sleeving. Some of the other artificial fibres such as > >dacron, kynar etc. might also be good - I'm not sure of their > >electrical > >properties. > > > > > >On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby < > >drkirkby@kirkbymicrowave.co.uk> wrote: > > > >> I have been discussing with some friends about the Oxford Bell with a > >view > >> to making one. One guy can not believe a battery can last 175 years. > >> > >> Anyway, I was wondering what would make a good insulator to suspend > >the > >> ball. I thought of nylon fishing like, but can anyone think of a > >better > >> insulator? Obviously PTFE is a good insulator, but it’s not exactly > >> flexible. Nor is sapphire. > >> > >> Dave > >> -- > >> Dr. David Kirkby, > >> _______________________________________________ > >> volt-nuts mailing list -- volt-nuts@lists.febo.com > >> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > >> and follow the instructions there. > >> > >_______________________________________________ > >volt-nuts mailing list -- volt-nuts@lists.febo.com > >To unsubscribe, go to > >http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > >and follow the instructions there. > _______________________________________________ > volt-nuts mailing list -- volt-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > and follow the instructions there. >

AP

Alex Pummer

Mon, Jul 22, 2019 9:53 PM

how about silk?

KJ6UHN Alex

On 7/22/2019 1:02 PM, Rob Klein wrote:

We can be fairly certain that materials like Nylon and PTFE were not around when the original bell was made ...

Someting like (waxed) silk, perhaps?

⁣Met vriendelijke groet,
Rob Klein

verstuurd vanaf mijn smartphone

Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin artgodwin@gmail.com schreef:

Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible
when
thin - eg PTFE sleeving. Some of the other artificial fibres such as
dacron, kynar etc. might also be good - I'm not sure of their
electrical
properties.

On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby <
drkirkby@kirkbymicrowave.co.uk> wrote:

I have been discussing with some friends about the Oxford Bell with a

view

to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend

the

ball. I thought of nylon fishing like, but can anyone think of a

better

insulator? Obviously PTFE is a good insulator, but it’s not exactly
flexible. Nor is sapphire.

Dave

Dr. David Kirkby,

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
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volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.

This email has been checked for viruses by AVG.
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how about silk? KJ6UHN Alex On 7/22/2019 1:02 PM, Rob Klein wrote: > We can be fairly certain that materials like Nylon and PTFE were not around when the original bell was made ... > > Someting like (waxed) silk, perhaps? > > > ⁣Met vriendelijke groet, > Rob Klein > > verstuurd vanaf mijn smartphone > > Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin <artgodwin@gmail.com> schreef: >> Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible >> when >> thin - eg PTFE sleeving. Some of the other artificial fibres such as >> dacron, kynar etc. might also be good - I'm not sure of their >> electrical >> properties. >> >> >> On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby < >> drkirkby@kirkbymicrowave.co.uk> wrote: >> >>> I have been discussing with some friends about the Oxford Bell with a >> view >>> to making one. One guy can not believe a battery can last 175 years. >>> >>> Anyway, I was wondering what would make a good insulator to suspend >> the >>> ball. I thought of nylon fishing like, but can anyone think of a >> better >>> insulator? Obviously PTFE is a good insulator, but it’s not exactly >>> flexible. Nor is sapphire. >>> >>> Dave >>> -- >>> Dr. David Kirkby, >>> _______________________________________________ >>> volt-nuts mailing list -- volt-nuts@lists.febo.com >>> To unsubscribe, go to >>> http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com >>> and follow the instructions there. >>> >> _______________________________________________ >> volt-nuts mailing list -- volt-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com >> and follow the instructions there. > _______________________________________________ > volt-nuts mailing list -- volt-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > and follow the instructions there. > > > --- > This email has been checked for viruses by AVG. > https://www.avg.com

G

geoelectronics@rallstech.net

Mon, Jul 22, 2019 10:09 PM

Kevlar. Stronger than silk.

George Dowell

On 2019/07/22 04:53 PM, Alex Pummer wrote:

how about silk?

KJ6UHN Alex

On 7/22/2019 1:02 PM, Rob Klein wrote: We can be fairly certain that materials like Nylon and PTFE were not around when the original bell was made ...

Someting like (waxed) silk, perhaps?

⁣Met vriendelijke groet,
Rob Klein

verstuurd vanaf mijn smartphone

Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin artgodwin@gmail.com schreef: Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible
when
thin - eg PTFE sleeving. Some of the other artificial fibres such as
dacron, kynar etc. might also be good - I'm not sure of their
electrical
properties.

On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby <
drkirkby@kirkbymicrowave.co.uk> wrote:

I have been discussing with some friends about the Oxford Bell with a view to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend the ball. I thought of nylon fishing like, but can anyone think of a better insulator? Obviously PTFE is a good insulator, but it's not exactly
flexible. Nor is sapphire.

Dave

Dr. David Kirkby,

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.

This email has been checked for viruses by AVG.
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volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.

Kevlar. Stronger than silk. George Dowell On 2019/07/22 04:53 PM, Alex Pummer wrote: > how about silk? > > KJ6UHN Alex > > On 7/22/2019 1:02 PM, Rob Klein wrote: We can be fairly certain that materials like Nylon and PTFE were not around when the original bell was made ... > > Someting like (waxed) silk, perhaps? > > ⁣Met vriendelijke groet, > Rob Klein > > verstuurd vanaf mijn smartphone > > Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin <artgodwin@gmail.com> schreef: Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible > when > thin - eg PTFE sleeving. Some of the other artificial fibres such as > dacron, kynar etc. might also be good - I'm not sure of their > electrical > properties. > > On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby < > drkirkby@kirkbymicrowave.co.uk> wrote: > > I have been discussing with some friends about the Oxford Bell with a view to making one. One guy can not believe a battery can last 175 years. > > Anyway, I was wondering what would make a good insulator to suspend the ball. I thought of nylon fishing like, but can anyone think of a better insulator? Obviously PTFE is a good insulator, but it's not exactly > flexible. Nor is sapphire. > > Dave > -- > Dr. David Kirkby, > _______________________________________________ > volt-nuts mailing list -- volt-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ > volt-nuts mailing list -- volt-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ volt-nuts mailing list -- volt-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there. --- This email has been checked for viruses by AVG. https://www.avg.com _______________________________________________ volt-nuts mailing list -- volt-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there.

DD

Dr. David Kirkby

Mon, Jul 22, 2019 10:21 PM

On Mon, 22 Jul 2019 at 22:54, Alex Pummer alex@pcscons.com wrote:

how about silk?

KJ6UHN Alex

I would have thought silk would just absorb moisture, lowering its
electrical resistance.

I do have an Agilent high resistance meter that in theory can measure up to
16 Peta ohm, but in practice I think noise becomes very significant, even
though it has a 1 kV source.

On 7/22/2019 1:02 PM, Rob Klein wrote:

We can be fairly certain that materials like Nylon and PTFE were not

around when the original bell was made ...

Someting like (waxed) silk, perhaps?

⁣Met vriendelijke groet,
Rob Klein

verstuurd vanaf mijn smartphone

Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin artgodwin@gmail.com

schreef:

Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible
when
thin - eg PTFE sleeving. Some of the other artificial fibres such as
dacron, kynar etc. might also be good - I'm not sure of their
electrical
properties.

On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby <
drkirkby@kirkbymicrowave.co.uk> wrote:

I have been discussing with some friends about the Oxford Bell with a

view

to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend

the

ball. I thought of nylon fishing like, but can anyone think of a

better

insulator? Obviously PTFE is a good insulator, but it’s not exactly
flexible. Nor is sapphire.

Dave

Dr. David Kirkby,

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to

http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com

and follow the instructions there.

This email has been checked for viruses by AVG.
https://www.avg.com

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to
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and follow the instructions there.

--
Dr. David Kirkby,

On Mon, 22 Jul 2019 at 22:54, Alex Pummer <alex@pcscons.com> wrote: > how about silk? > > KJ6UHN Alex I would have thought silk would just absorb moisture, lowering its electrical resistance. I do have an Agilent high resistance meter that in theory can measure up to 16 Peta ohm, but in practice I think noise becomes very significant, even though it has a 1 kV source. > > > On 7/22/2019 1:02 PM, Rob Klein wrote: > > We can be fairly certain that materials like Nylon and PTFE were not > around when the original bell was made ... > > > > Someting like (waxed) silk, perhaps? > > > > > > ⁣Met vriendelijke groet, > > Rob Klein > > > > verstuurd vanaf mijn smartphone > > > > Op 22 jul. 2019 21:40, om 21:40, Adrian Godwin <artgodwin@gmail.com> > schreef: > >> Nylon is hygroscopic. Doesn't seem like a good idea. PTFE is flexible > >> when > >> thin - eg PTFE sleeving. Some of the other artificial fibres such as > >> dacron, kynar etc. might also be good - I'm not sure of their > >> electrical > >> properties. > >> > >> > >> On Mon, Jul 22, 2019 at 7:17 PM Dr. David Kirkby < > >> drkirkby@kirkbymicrowave.co.uk> wrote: > >> > >>> I have been discussing with some friends about the Oxford Bell with a > >> view > >>> to making one. One guy can not believe a battery can last 175 years. > >>> > >>> Anyway, I was wondering what would make a good insulator to suspend > >> the > >>> ball. I thought of nylon fishing like, but can anyone think of a > >> better > >>> insulator? Obviously PTFE is a good insulator, but it’s not exactly > >>> flexible. Nor is sapphire. > >>> > >>> Dave > >>> -- > >>> Dr. David Kirkby, > >>> _______________________________________________ > >>> volt-nuts mailing list -- volt-nuts@lists.febo.com > >>> To unsubscribe, go to > >>> http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > >>> and follow the instructions there. > >>> > >> _______________________________________________ > >> volt-nuts mailing list -- volt-nuts@lists.febo.com > >> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > >> and follow the instructions there. > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@lists.febo.com > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > > and follow the instructions there. > > > > > > --- > > This email has been checked for viruses by AVG. > > https://www.avg.com > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > and follow the instructions there. > -- Dr. David Kirkby,

LM

Laurence Motteram

Mon, Jul 22, 2019 11:01 PM

Does the string really have to be a very good insulator? It is long and has a small cross section, and is electrically in parallel with the case of the battery.

Best Regards,

Laurence Motteram
Calibration & Service Manager
Scientific Devices Australia
Ph: +61 (0)3 9569 1366
M: +61 (0)425 765 019
https://scientific-devices.com.au
lmotteram@scientific-devices.com.au

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@lists.febo.com] On Behalf Of Dr. David Kirkby
Sent: Tuesday, 23 July 2019 4:17 AM
To: Discussion of precise voltage measurement
Subject: [volt-nuts] Can anyone suggest a good flexible insulator to make an “Oxford Bell”

I have been discussing with some friends about the Oxford Bell with a view
to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend the
ball. I thought of nylon fishing like, but can anyone think of a better
insulator? Obviously PTFE is a good insulator, but it’s not exactly
flexible. Nor is sapphire.

Dave

Dr. David Kirkby,

volt-nuts mailing list -- volt-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.

Does the string really have to be a very good insulator? It is long and has a small cross section, and is electrically in parallel with the case of the battery. Best Regards, Laurence Motteram Calibration & Service Manager Scientific Devices Australia Ph: +61 (0)3 9569 1366 M: +61 (0)425 765 019 https://scientific-devices.com.au lmotteram@scientific-devices.com.au -----Original Message----- From: volt-nuts [mailto:volt-nuts-bounces@lists.febo.com] On Behalf Of Dr. David Kirkby Sent: Tuesday, 23 July 2019 4:17 AM To: Discussion of precise voltage measurement Subject: [volt-nuts] Can anyone suggest a good flexible insulator to make an “Oxford Bell” I have been discussing with some friends about the Oxford Bell with a view to making one. One guy can not believe a battery can last 175 years. Anyway, I was wondering what would make a good insulator to suspend the ball. I thought of nylon fishing like, but can anyone think of a better insulator? Obviously PTFE is a good insulator, but it’s not exactly flexible. Nor is sapphire. Dave -- Dr. David Kirkby, _______________________________________________ volt-nuts mailing list -- volt-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there.

G

geoelectronics@rallstech.net

Mon, Jul 22, 2019 11:14 PM

Yes, it must be isolated electrically so the ball can be the only
carrier of static charge.

George Dowell

On 2019/07/22 06:01 PM, Laurence Motteram wrote:

Does the string really have to be a very good insulator? It is long and has a small cross section, and is electrically in parallel with the case of the battery.

Best Regards,

Laurence Motteram
Calibration & Service Manager
Scientific Devices Australia
Ph: +61 (0)3 9569 1366
M: +61 (0)425 765 019
https://scientific-devices.com.au
lmotteram@scientific-devices.com.au

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces@lists.febo.com] On Behalf Of Dr. David Kirkby
Sent: Tuesday, 23 July 2019 4:17 AM
To: Discussion of precise voltage measurement
Subject: [volt-nuts] Can anyone suggest a good flexible insulator to make an "Oxford Bell"

I have been discussing with some friends about the Oxford Bell with a view
to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend the
ball. I thought of nylon fishing like, but can anyone think of a better
insulator? Obviously PTFE is a good insulator, but it's not exactly
flexible. Nor is sapphire.

Dave

Yes, it must be isolated electrically so the ball can be the only carrier of static charge. George Dowell On 2019/07/22 06:01 PM, Laurence Motteram wrote: > Does the string really have to be a very good insulator? It is long and has a small cross section, and is electrically in parallel with the case of the battery. > > Best Regards, > > Laurence Motteram > Calibration & Service Manager > Scientific Devices Australia > Ph: +61 (0)3 9569 1366 > M: +61 (0)425 765 019 > https://scientific-devices.com.au > lmotteram@scientific-devices.com.au > > -----Original Message----- > From: volt-nuts [mailto:volt-nuts-bounces@lists.febo.com] On Behalf Of Dr. David Kirkby > Sent: Tuesday, 23 July 2019 4:17 AM > To: Discussion of precise voltage measurement > Subject: [volt-nuts] Can anyone suggest a good flexible insulator to make an "Oxford Bell" > > I have been discussing with some friends about the Oxford Bell with a view > to making one. One guy can not believe a battery can last 175 years. > > Anyway, I was wondering what would make a good insulator to suspend the > ball. I thought of nylon fishing like, but can anyone think of a better > insulator? Obviously PTFE is a good insulator, but it's not exactly > flexible. Nor is sapphire. > > Dave

Z

zl3ag@radioengineering.com

Mon, Jul 22, 2019 11:46 PM

What is dental floss made from?

On 23/07/19 6:16 am, Dr. David Kirkby wrote:

I have been discussing with some friends about the Oxford Bell with a view
to making one. One guy can not believe a battery can last 175 years.

Anyway, I was wondering what would make a good insulator to suspend the
ball. I thought of nylon fishing like, but can anyone think of a better
insulator? Obviously PTFE is a good insulator, but it’s not exactly
flexible. Nor is sapphire.

Dave

What is dental floss made from? On 23/07/19 6:16 am, Dr. David Kirkby wrote: > I have been discussing with some friends about the Oxford Bell with a view > to making one. One guy can not believe a battery can last 175 years. > > Anyway, I was wondering what would make a good insulator to suspend the > ball. I thought of nylon fishing like, but can anyone think of a better > insulator? Obviously PTFE is a good insulator, but it’s not exactly > flexible. Nor is sapphire. > > Dave >