Bulk tape eraser
Allyn Lai
Hi!
Where can I buy a bulk tape eraser in the UK? I need something that
will bulk erase 8mm DAT tapes.
Thanks!
--
Allyn Lai
Frank Erskine
<al...@allyn.demon.co.uk> writes
>
>Hi!
>
>Where can I buy a bulk tape eraser in the UK? I need something that
>will bulk erase 8mm DAT tapes.
>
>Thanks!
Canford Audio, on 0191 415 0205.
Be warned though - they aren't cheap! The cheapest one they sell is
over 100 ukp...and that's just a simple handheld one :-(
--
Frank Erskine
Royalty Theatre Sunderland
Jim Dunnett
<fr...@g3wte.demon.co.uk> wrote:
>In article <THDVwBAA...@allyn.demon.co.uk>, Allyn Lai
><al...@allyn.demon.co.uk> writes
>>
>>Hi!
>>
>>Where can I buy a bulk tape eraser in the UK? I need something that
>>will bulk erase 8mm DAT tapes.
>>
>>Thanks!
>
>Canford Audio, on 0191 415 0205.
>
>Be warned though - they aren't cheap! The cheapest one they sell is
>over 100 ukp...and that's just a simple handheld one :-(
We have a huge one at work. Rattles your fillings
at 2 metres.
Anyone know exactly how they work? Could they be
homebrewed?
--
- Jim, g4rga |
olympus@jimdee%prestel.co.uk | We all need Europe, but
g4rga%aol.com | Germans need it most of all.
g4rga@gb7tjf.#45.gbr.eu |
| -- Helmut Kohl. 1930 -
Rallies info: www2.prestel.co.uk/jimdee
rob...@bob54.demon.co.uk
enough magnetic field to wipe a dat tape. These are relatively cheap
(about 10ukp-ish)
As far as I am aware a bulk tape eraser simply generates a hulking
alternating magnetic field? We also have one at work, and yes I can
confirm I also have loose fillings.
rgds,
Bob.
On Thu, 13 Aug 1998 08:05:36 +0100, Allyn Lai
<al...@allyn.demon.co.uk> wrote:
>
>Hi!
>
>Where can I buy a bulk tape eraser in the UK? I need something that
>will bulk erase 8mm DAT tapes.
>
>Thanks!
>--
>Allyn Lai
Chris Isbell
>
>Hi!
>
>Where can I buy a bulk tape eraser in the UK? I need something that
>will bulk erase 8mm DAT tapes.
>
>Thanks!
You could build one by dismantling a transformer and rearranging the
laminations. (Be careful if it is mains! Standard disclaimers apply.)
BTW: DAT tapes are 4mm. 8mm tapes are a different format. Note: If these
are computer tapes, they may well be pre-formatted and bulk erasing
could well render them useless. (Using a computer DAT tape for audio
makes it useless for data.)
--
Chris Isbell
Southampton, England
ch...@isbell.demon.co.uk
+44 1703 465367
http://www.isbell.demon.co.uk
Frank Erskine
<olympus@jimdee%prestel.co.uk> writes
>On Thu, 13 Aug 1998 10:46:36 +0100, Frank Erskine
><fr...@g3wte.demon.co.uk> wrote:
>
>>In article <THDVwBAA...@allyn.demon.co.uk>, Allyn Lai
>><al...@allyn.demon.co.uk> writes
>>>
>>>
>>>Where can I buy a bulk tape eraser in the UK? I need something that
>>>will bulk erase 8mm DAT tapes.
>>>
>>>Thanks!
>>
>>
>>Be warned though - they aren't cheap! The cheapest one they sell is
>>over 100 ukp...and that's just a simple handheld one :-(
>
>We have a huge one at work. Rattles your fillings
>at 2 metres.
Ask your dentist for non-ferrous fillings and/or crowns!
>
>Anyone know exactly how they work? Could they be
>homebrewed?
Basically they're just a large ac electromagnet, but the "static" ones,
as opposed to handheld, will have some sort of slowly decaying magnetic
field - a bit like the degaussing circuit of a TV set. If you didn't,
you'd have to remove the tapes slowly from the electromagnet before
switching it off, to prevent any polarisation of the magnetic media.
73 -
--
Frank Erskine
Sunderland
Don't go metric - feet, BSF, Whitworth and inches are miles better
Frank Erskine
Isbell <ch...@isbell.demon.co.uk> writes
>Allyn Lai <al...@allyn.demon.co.uk> wrote:
>
>>
>>Hi!
>>
>>Where can I buy a bulk tape eraser in the UK? I need something that
>>will bulk erase 8mm DAT tapes.
>>
>>Thanks!
>
>laminations. (Be careful if it is mains! Standard disclaimers apply.)
>
>BTW: DAT tapes are 4mm. 8mm tapes are a different format. Note: If these
>are computer tapes, they may well be pre-formatted and bulk erasing
>could well render them useless. (Using a computer DAT tape for audio
>makes it useless for data.)
>
suitable for DAT tapes. Unless these erasers magically ignore
formatting (!) there shouldn't be a problem :-)
ps - I have no connection with Canford, except as a satisfied customer.
Allyn Lai
<fr...@g3wte.demon.co.uk> writes
>>
>>Where can I buy a bulk tape eraser in the UK? I need something that
>>will bulk erase 8mm DAT tapes.
>>
>>Thanks!
>
>
>Be warned though - they aren't cheap! The cheapest one they sell is
>over 100 ukp...and that's just a simple handheld one :-(
Good grief! In the U.S., Tandy sells them for maybe $40? Hmmm...I'll
have to think about this...
Thanks!
--
Allyn Lai
Gareth Alun Evans
Allyn Lai wrote in message ...
>
>Good grief! In the U.S., Tandy sells them for maybe $40? Hmmm...I'll
>have to think about this...
Use Tandy at your peril. The Chippenham branch has just been fined
£4000 for passing off soiled (previous customer returns) goods as
brand-new.
Gareth Alun Evans
Frank Erskine wrote in message ...
> Don't go metric - feet, BSF, Whitworth and inches are miles better
Are you off your rod, pole or perch?
Lost your scruples?
Firkin Ell!
Simon Lewis
Alun Evans <gar...@cemetery.demon.co.uk> writes
I think Dixons had the same - I think I can recall an item on the news
about this. The giveaway? Someone's personal WP files on the hard disk!
Duh!
73 Simon GM4PLM
+--------------------------------------------------------------------+
| Simon Lewis GM4PLM Editor - EMN |
| European Microwave News - Supporting Microwave Radio Across Europe |
| Homepage - www.pacsat.demon.co.uk Email e...@pacsat.demon.co.uk |
+--------------------------------------------------------------------+
Roy Brown
Alun Evans <gar...@cemetery.demon.co.uk> writes
>
Hey, who are you hectaring?
Stop being so bloody rood, or I'll have to give you a couple of acres!
Malcolm Austen
Jim Dunnett <Jim Dunnett> wrote:
>>In article <THDVwBAA...@allyn.demon.co.uk>, Allyn Lai
>><al...@allyn.demon.co.uk> writes
>>>will bulk erase 8mm DAT tapes.
>homebrewed?
They work pretty much like the degaussing circuit on a TV or computer
monitor - just a large coil, VDR and 230VAC.
I've no idea how effective this H/B trick would be on DAT tapes ...
in the days of mechanical watches the solution to a magnetised works
was to tape the watch to the screen of a (colour) TV and turn in on a
few times. Modern monitors (at least good ones 17" and upwards) have a
degauss button so the screen can be zapped without power cycling
it. If it works, maybe you could use it as an excuse for a
bigger/better monitor? 8-)
.73 Malcolm.
--- --- --- --- --- --- --- - --- - --- -
M0AEN ... RSGB, GQRP(3365), Harwell ARS
Malcolm...@OUCS.ox.ac.uk http://users.ox.ac.uk/~malcolm/
Laurence Taylor
royb...@affirm.co.uk "Roy Brown" writes:
-> >> Don't go metric - feet, BSF, Whitworth and inches are miles better
-> >
-> >Are you off your rod, pole or perch?
-> >Lost your scruples?
-> >
-> >Firkin Ell!
->
-> Hey, who are you hectaring?
-> Stop being so bloody rood, or I'll have to give you a couple of acres!
This chain looks as though it could get into the same league as the fish
jokes!
rgds
LAurence
Allyn Lai
Isbell <ch...@isbell.demon.co.uk> writes
>Allyn Lai <al...@allyn.demon.co.uk> wrote:
>
>>
>>Hi!
>>
>>will bulk erase 8mm DAT tapes.
>>
>
>You could build one by dismantling a transformer and rearranging the
>laminations. (Be careful if it is mains! Standard disclaimers apply.)
>
>BTW: DAT tapes are 4mm. 8mm tapes are a different format. Note: If these
>are computer tapes, they may well be pre-formatted and bulk erasing
>could well render them useless. (Using a computer DAT tape for audio
>makes it useless for data.)
>
Well whatever they're called, I'm using 8mm tapes with Exabyte EXB-
8700LT drives.
We used to use a EXB-8200 and now that we've upgraded I've found out
that tapes written on a EXB-8200 can only be READ on a EXB-8700LT but
CANNOT BE WRITTEN to. In order to reuse my old tapes I have to either
bulk erase them or run them through my 8mm camcorder (just for a few
minutes actually). I would prefer to use a proper bulk eraser but if
they're that pricey....
--
Allyn Lai
Jason Ellis
Allyn Lai wrote in message <0o7s7LAl...@allyn.demon.co.uk>...
Jim Dunnett
<gar...@cemetery.demon.co.uk> wrote:
>Frank Erskine wrote in message ...
>
>> Don't go metric - feet, BSF, Whitworth and inches are miles better
>
>Are you off your rod, pole or perch?
>Lost your scruples?
All four, evidently!
Jim Dunnett
Isbell) wrote:
>You could build one by dismantling a transformer and rearranging the
>laminations. (Be careful if it is mains! Standard disclaimers apply.)
Rearrange them how?
I can effectively degauss (sp?) a disc with the
circular magnet salvaged from a big loudspeaker, but
it's a bit time consuming.
>BTW: DAT tapes are 4mm. 8mm tapes are a different format. Note: If these
>are computer tapes, they may well be pre-formatted and bulk erasing
>could well render them useless. (Using a computer DAT tape for audio
>makes it useless for data.)
My tape streamer will format blank tapes; thought
they all did.
Paul Kearney
: I would have thought a tape head degausser would chuck off a big
: enough magnetic field to wipe a dat tape. These are relatively cheap
: (about 10ukp-ish)
which leads me nicely into the realm of ...
why not use a transformer with the "I" bar taken off ?
"I" bar as in transformer made of metal layers in shape
of an "E" with another shape of layers in shape if "I"
making up the magnetic circuit.
take the "I" off and watch those ''free north poles'' flow Man!
Then when you hold the transformer near a tape, you will
a. erase tape.
b. electrocute yourself.
c. both of the above
d. none of the above.
73
"i used to be on packet but i'm better now"
*** remove nospam for real address
Alan J Holmes
>: I would have thought a tape head degausser would chuck off a big
>: enough magnetic field to wipe a dat tape. These are relatively cheap
>: (about 10ukp-ish)
>which leads me nicely into the realm of ...
>why not use a transformer with the "I" bar taken off ?
>"I" bar as in transformer made of metal layers in shape
>of an "E" with another shape of layers in shape if "I"
>making up the magnetic circuit.
>take the "I" off and watch those ''free north poles'' flow Man!
But any decent mains transformers will have the 'E' and 'I'
interleaved, so you would nedd to completely dismantle the
transformer and assmeble the core all in the same direction.
>Then when you hold the transformer near a tape, you will
>a. erase tape.
>b. electrocute yourself.
>c. both of the above
>d. none of the above.
--
Alan G4CRW, Ex FAA, RNARS and others!
Here I sit, giving the world the benefit of my words of wit and wisdom!
What an exciting life I lead!(:-)
Richard Herring
> In article <35d4e1c...@news.iol.ie>,
> Paul Kearney <ei...@nospam.iol.ie> wrote:
> >rob...@bob54.demon.co.uk wrote:
> >: I would have thought a tape head degausser would chuck off a big
> >: enough magnetic field to wipe a dat tape. These are relatively cheap
> >: (about 10ukp-ish)
> >which leads me nicely into the realm of ...
> >why not use a transformer with the "I" bar taken off ?
> >"I" bar as in transformer made of metal layers in shape
> >of an "E" with another shape of layers in shape if "I"
> >making up the magnetic circuit.
> >take the "I" off and watch those ''free north poles'' flow Man!
> But any decent mains transformers will have the 'E' and 'I'
> interleaved, so you would nedd to completely dismantle the
> transformer and assmeble the core all in the same direction.
Try an old smoothing choke instead. They sometimes have all the
laminations the same way round, to allow a controlled gap in the
magnetic circuit.
--
Richard Herring | <richard...@gecm.com>
Alan J Holmes
>>In article <THDVwBAA...@allyn.demon.co.uk>, Allyn Lai
>><al...@allyn.demon.co.uk> writes
>>>Hi!
>>>Where can I buy a bulk tape eraser in the UK? I need something that
>>>will bulk erase 8mm DAT tapes.
Stuff deleted:-
>Anyone know exactly how they work? Could they be
>homebrewed?
For demagnetising tools I used to take a standard reel of
RS single core wire, connect the ends to the mains and,
hey presto, one demagnetiser!
Don't leave it switched on for long though!
Bob Balser
called A.C.Farnell Ltd,Hereford House,North Court,Vicar Lane,Leeds 2 I wonder if their still
in business?
Bob
Frank Erskine
<r...@gmrc.gecm.com> writes
>In article <6r98e0$d...@loki.brunel.ac.uk>, Alan J Holmes
>(Alan....@brunel.ac.uk) wrote:
>> In article <35d4e1c...@news.iol.ie>,
>> Paul Kearney <ei...@nospam.iol.ie> wrote:
>> >rob...@bob54.demon.co.uk wrote:
>
>> >: I would have thought a tape head degausser would chuck off a big
>> >: enough magnetic field to wipe a dat tape. These are relatively cheap
>> >: (about 10ukp-ish)
>
>> >which leads me nicely into the realm of ...
>
>> >why not use a transformer with the "I" bar taken off ?
>
>> >"I" bar as in transformer made of metal layers in shape
>> >of an "E" with another shape of layers in shape if "I"
>> >making up the magnetic circuit.
>> >take the "I" off and watch those ''free north poles'' flow Man!
>
>> But any decent mains transformers will have the 'E' and 'I'
>> interleaved, so you would nedd to completely dismantle the
>> transformer and assmeble the core all in the same direction.
>
>Try an old smoothing choke instead. They sometimes have all the
>laminations the same way round, to allow a controlled gap in the
>magnetic circuit.
>
want to bulk erase on a reasonable scale, rather than just the odd one
in a "radio shack" environment.
A problem with using such as a smoothing choke, or a loudspeaker magnet,
is that you'd have to very careful with "wanted" tapes/disks in the
vicinity.
Many of the larger "proper" erasers are magnetically shielded - the tape
is placed inside and a mumetal (?) door closed before the machine can be
switched on.
Rgds -
--
Frank Erskine
Sunderland
Don't go metric - foot, pint and pound are perfectly sound.
Alan J Holmes
Richard Herring <richard...@gecm.com> wrote:
>In article <6r98e0$d...@loki.brunel.ac.uk>, Alan J Holmes (Alan....@brunel.ac.uk) wrote:
>> In article <35d4e1c...@news.iol.ie>,
>> Paul Kearney <ei...@nospam.iol.ie> wrote:
>> >rob...@bob54.demon.co.uk wrote:
>> >: I would have thought a tape head degausser would chuck off a big
>> >: enough magnetic field to wipe a dat tape. These are relatively cheap
>> >: (about 10ukp-ish)
>> >which leads me nicely into the realm of ...
>> >why not use a transformer with the "I" bar taken off ?
>> >"I" bar as in transformer made of metal layers in shape
>> >of an "E" with another shape of layers in shape if "I"
>> >making up the magnetic circuit.
>> >take the "I" off and watch those ''free north poles'' flow Man!
>> But any decent mains transformers will have the 'E' and 'I'
>> interleaved, so you would nedd to completely dismantle the
>> transformer and assmeble the core all in the same direction.
>Try an old smoothing choke instead. They sometimes have all the
>laminations the same way round, to allow a controlled gap in the
>magnetic circuit.
And I just happen to have some of those, if the original posted
would like to get in touch with me!
Alan J Holmes
Bob Balser <bob.b...@virgin.net> wrote:
>I have a tape eraser designed for reel tapes.Bought many,many years ago & made by a firm
>called A.C.Farnell Ltd,Hereford House,North Court,Vicar Lane,Leeds 2 I wonder if their still
>in business?
Farnell are still in busines, but now only as distributors fo
other peoples materials, I believe.
John Mortlock
Bob Balser wrote in message <35D93A40...@virgin.net>...
>I have a tape eraser designed for reel tapes.Bought many,many years ago &
made by >a firm called A.C.Farnell Ltd,Hereford House,North Court,Vicar
Lane,Leeds 2 I >wonder if their still in business?
Still in business ? They are one of the biggest electronic component
distributors in the country with offices in many other countries.
Farnell Electronic Components Limited http://www.farnell.com
Canal Road
Leeds LS12 2TU
Jon Hind
And what were they used for ?
The kids have been singing a Doris Day song and want to know :)
Jon Hind, G8EDS.
Jim Dunnett
Yes but try getting a catalogue out of them!
--
- Jim, g4rga | Je me presse de rire de tout,
olympus@jimdee%prestel.co.uk | de peur d'être obligé d'en
g4rga%aol.com | pleurer.
g4rga@gb7tjf.#45.gbr.eu |
| -- Beaumarchais 1732-1799.
Rallies info: www2.prestel.co.uk/jimdee
Frank Erskine
<olympus@jimdee%prestel.co.uk> writes
>On Tue, 18 Aug 1998 14:04:45 +0100, "John Mortlock"
><jm...@freenet.uk.com> wrote:
>
>>
>>Bob Balser wrote in message <35D93A40...@virgin.net>...
>>>I have a tape eraser designed for reel tapes.Bought many,many years ago &
>>made by >a firm called A.C.Farnell Ltd,Hereford House,North Court,Vicar
>>Lane,Leeds 2 I >wonder if their still in business?
>>
>>
>>Still in business ? They are one of the biggest electronic component
>>distributors in the country with offices in many other countries.
>>
>>Farnell Electronic Components Limited http://www.farnell.com
>>Canal Road
>>Leeds LS12 2TU
>
>Yes but try getting a catalogue out of them!
I've got one (October 97) and it would appear that anybody can order
stuff from them. They don't have a minimum order, and you can pay by
plastic. If however you want to open an account you have to have trade
references.
73 -
--
Frank Erskine
Sunderland
Ian White, G3SEK
>>>Bob Balser wrote in message <35D93A40...@virgin.net>...
>>>>I have a tape eraser designed for reel tapes.Bought many,many years ago &
>>>made by >a firm called A.C.Farnell Ltd,Hereford House,North Court,Vicar
>>>Lane,Leeds 2 I >wonder if their still in business?
>>>
>>>
>>>Still in business ? They are one of the biggest electronic component
>>>distributors in the country with offices in many other countries.
>>>
In other words, the answer to the original question is probably "no".
>>>Farnell Electronic Components Limited http://www.farnell.com
>>>Canal Road
>>>Leeds LS12 2TU
>>
>>Yes but try getting a catalogue out of them!
>
If you present yourself as a private individual, who has never bought
from them, you're unlikely to get a catalogue at first request. (Those
catalogues are expensive, so they need to feel they'll get their money
back from you.)
To get yourself started, borrow a catalogue from somebody else or arrange
a regular pipleine for just-expired catalogues from somebody's firm. You
can check current prices on their web site, but they vary relatively
little and the credit card method can dela with that.
Once you've established some track record, of regular orders, you're much
more likely to get a catalogue if you ask for one.
>I've got one (October 97) and it would appear that anybody can order
>stuff from them. They don't have a minimum order, and you can pay by
>plastic.
Terms and conditions come and go, but at present that is correct.
>If however you want to open an account you have to have trade
>references.
Again, this is subject to change, but after a few months of ordering by
credit card my one-person firm was given a £500 credit account with no
references. The rep actually came to call (against my protests and
warnings that this was pretty small business) and practically forced an
account on me. Needless to say, I gave in!
However, on the one occasion when I had a £1200 order, they did indeed
ask for two trade references to upgrade the credit level.
There really isn't much difference between the two methods of payment.
The account requires payment by the 20th of the following month, very
much like paying the credit card bill in full on a similar date. If
you're going to settle in full, a cash-back credit card is the cheaper
method.
73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.demon.co.uk/g3sek
Andy Lake
> >
> If you present yourself as a private individual, who has never bought
> from them, you're unlikely to get a catalogue at first request. (Those
> catalogues are expensive, so they need to feel they'll get their money
> back from you.)
>
I 'phoned them about 4 months ago, and got the paper AND CD-ROM
Catalogues free, as a private customer.(The old "borrowed" one I was
using was a bit dog-eared!)
Was I just lucky, then?!! :-)
73
Andy
Jim Dunnett
<fr...@g3wte.demon.co.uk> wrote:
>I've got one (October 97) and it would appear that anybody can order
>stuff from them. They don't have a minimum order, and you can pay by
>plastic. If however you want to open an account you have to have trade
>references.
They wouldn't give me a catalogue without two
references.
Ian White, G3SEK
Who knows? It all seems to depend on catching the right phases of a
company's marketing budget and policy.
It's always worth a try - but be sure to sound professional and
businesslike on the phone. For Net users, filling in a form on a web
page may be the better option.
Frank Erskine
<olympus@jimdee%prestel.co.uk> writes
>On Wed, 19 Aug 1998 23:00:05 +0100, Frank Erskine
><fr...@g3wte.demon.co.uk> wrote:
>
>>I've got one (October 97) and it would appear that anybody can order
>>stuff from them. They don't have a minimum order, and you can pay by
>>plastic. If however you want to open an account you have to have trade
>>references.
>
>They wouldn't give me a catalogue without two
>references.
You didn't tell them that you're only a G4, and against the Morse test,
did you? ;-)
--
Frank Erskine
Sunderland
http://www.g3wte.demon.co.uk/
Mike Willis
>
>
>
> They wouldn't give me a catalogue without two
> references.
> --
And I usually have trouble disposing of the old ones. If you fancy a
challenge, try getting one out of CPC!
--
Mike
(Remove the space from the Email address to reply)
Jim Dunnett
<fr...@g3wte.demon.co.uk> wrote:
>In article <35dc5951...@news.prestel.co.uk>, Jim Dunnett
><olympus@jimdee%prestel.co.uk> writes
>>On Wed, 19 Aug 1998 23:00:05 +0100, Frank Erskine
>><fr...@g3wte.demon.co.uk> wrote:
>>
>>>I've got one (October 97) and it would appear that anybody can order
>>>stuff from them. They don't have a minimum order, and you can pay by
>>>plastic. If however you want to open an account you have to have trade
>>>references.
>>
>>They wouldn't give me a catalogue without two
>>references.
>
>
>You didn't tell them that you're only a G4, and against the Morse test,
>did you? ;-)
Sheesh! So that's what it was?
--
- Jim, g4rga | Vive le QuＣec!
olympus@jimdee%prestel.co.uk | Vive le QuＣec libre!!
g4rga%aol.com |
g4rga@gb7tjf.#45.gbr.eu | -- Charles de Gaulle
| MontrＢl 25 July 1967.
Rallies info: www2.prestel.co.uk/jimdee
Jim Dunnett
"@rl.ac.uk> wrote:
>Jim Dunnett wrote:
>>
>> They wouldn't give me a catalogue without two
>> references.
>> --
>
>And I usually have trouble disposing of the old ones. If you fancy a
>challenge, try getting one out of CPC!
Who's CPC?
Brian Olliver
writes
--
Brian Olliver
Charles Stanley
>In article <VA.00000c24.0006b4f5@omnibook>, Jon Hind <jon...@cix.co.uk>
>writes
>>Ah an imperialist, can you convert bushel & peck to metric units ?
>>And what were they used for ?
>
>weight.
Jon wanted an answer to his first question, so here's what I've
gleaned from various sources:
a volume of one bushel (bu) = 36.369 dm^3 [or 0.036,369 m^3];
an `imperial bushel' = 2219.36 cubic inches [= 8 dry gallons];
and one peck (pk) is one quarter of a bushel = 9.092 dm^3;
where one dm^3 is almost indistinguishable from a litre.
Cheers from one for whom even a litre is a mystery when I go for
the `messages' [shopping, to those furth of the Border].
Frank Erskine
<csta...@zetnet.co.uk> writes
>On 29 Aug 1998 16:46:53 , Frank Erskine wrote:
>>In article <VA.00000c24.0006b4f5@omnibook>, Jon Hind <jon...@cix.co.uk>
>>writes
>>>Ah an imperialist, can you convert bushel & peck to metric units ?
>..
>>>And what were they used for ?
>>
>>Measuring grain etc - they're actually units of capacity rather than
>>weight.
>
>Jon wanted an answer to his first question,
I *gave* him an answer to his first question!
>>Well, yes, but who would want to do that?<<
--
Frank Erskine
Sunderland
Reg Edwards
> where one dm^3 is almost indistinguishable from a litre.
>
ALMOST?
- - - - - from where does the small difference arise ?
--
Reg G4FGQ
http://www.btinternet.com/~g4fgq.regp
Charles Stanley
>Charles Stanley wrote :-
>> where one dm^3 is almost indistinguishable from a litre.
>
>ALMOST?
>- - - - - from where does the small difference arise ?
Good question: I wondered too. Further reading supplies this info:-
From the fact that the standard metal cylinder, originally intended to
equal the volume of a cubic decimetre of pure water at standard
atmospheric pressure, was later measured accurately and found to be
28 parts per million too big, but was accepted as the standard of mass
as one kilogramme; the equivalent mass of water was named the litre
and hence 1 litre = 1 000 028 dm^3. Since 1964 the litre is taken as
equivalent to one dm^3, but not when high precision is needed.
Maybe space technology requires such high precision: would small
amounts of mass make a difference to calculations of thrust etc?
Cheers, Charles.