Thunder Horn

Steve said:

Stolen from gizmondo

http://gadget.brando.com.hk/prod_detail.php?prod_id=00451

A little compertition for the air zound perhaps?

Claims to be as loud but it's battery powered - might be more compact
and not require the hose and reservoir which would be handy.

Steve said:

Stolen from gizmondo

http://gadget.brando.com.hk/prod_detail.php?prod_id=00451

A little compertition for the air zound perhaps?

Ok, I'm a ficky, 115db wrt to what?

In article <[email hidden]>, Tosspot
[email hidden] says...

Quoted message said:

Steve said:

Stolen from gizmondo

http://gadget.brando.com.hk/prod_detail.php?prod_id=00451

A little compertition for the air zound perhaps?

Ok, I'm a ficky, 115db wrt to what?

What's a db? Assuming they mean a dB, I'm guessing it's 115dB
relative to something quieter than the quietest thing that a marketing
weasle could think of. :-\

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Steve said:

Stolen from gizmondo

http://gadget.brando.com.hk/prod_detail.php?prod_id=00451

A little compertition for the air zound perhaps?

Ok, I'm a ficky, 115db wrt to what?

How do you mean 'wrt to what' ? 'dB' is an SI unit, or rather a sub-unit, so
is a defined absolute.

David Lloyd

naked_draughtsman said:

Steve said:

Stolen from gizmondo

http://gadget.brando.com.hk/prod_detail.php?prod_id=00451

A little compertition for the air zound perhaps?

Claims to be as loud but it's battery powered - might be more compact
and not require the hose and reservoir which would be handy.

115Db, but at what distance?

David Lloyd said:

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Steve said:

Stolen from gizmondo

http://gadget.brando.com.hk/prod_detail.php?prod_id=00451

A little compertition for the air zound perhaps?

Ok, I'm a ficky, 115db wrt to what?

How do you mean 'wrt to what' ? 'dB' is an SI unit, or rather a sub-unit, so
is a defined absolute.

Actually it's a defined relative measure, not an absolute, being a
logarithmic scale with zero normally representing the threshhold of
hearing, when it's referred to as dB(A). But it (dB) is also used to
measure differences in volume (or 'Sound Pressure Level', to be more
precise), which would give quite a different value from just comparing
two 'relative to the hearing threshold' values.

In any event, for it to be meaningful as a measure of 'noise' you need
also to specify the distance from the source at which the measurement
is taken. The CE mark on equipment shows that it has been measured in
accordance with the regulations and is therefore a valid comparitor,
but something quoted, as this air horn, as 115dB 'Sound Output' is in
itself not so meaningful.

--
Ace in Alsace - brucedotrogers a.t rochedotcom

On Mon, 06 Aug 2007 07:48:00 GMT, "David Lloyd" <[email hidden]>

Quoted message said:

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Steve said:

Stolen from gizmondo

http://gadget.brando.com.hk/prod_detail.php?prod_id=00451

A little compertition for the air zound perhaps?

Ok, I'm a ficky, 115db wrt to what?

How do you mean 'wrt to what' ? 'dB' is an SI unit, or rather a sub-unit, so
is a defined absolute.

David Lloyd

It's anything but. It's simply the log 10 of the ratio between two values,
dimensionless. As Tosspot points out, without knowing the base value it's
meaningless. For acoustics the base value, 0dB, is normally taken as the
threshold of human hearing.

Neil

In article <[email hidden]>, rothers
[email hidden] says...

Quoted message said:

For acoustics the base value, 0dB, is normally taken as the
threshold of human hearing.

Eh? Did you say something?
:-)

David Lloyd said:

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Steve said:

Stolen from gizmondo

http://gadget.brando.com.hk/prod_detail.php?prod_id=00451

A little compertition for the air zound perhaps?

Ok, I'm a ficky, 115db wrt to what?

How do you mean 'wrt to what' ? 'dB' is an SI unit, or rather a sub-unit, so
is a defined absolute.

Well I can't find it

http://www.bipm.org/en/home/

In article <[email hidden]>, Tosspot
[email hidden] says...

Quoted message said:

David Lloyd said:

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Steve wrote:

>Stolen from gizmondo
>
>http://gadget.brando.com.hk/prod_detail.php?prod_id=00451
>
>A little compertition for the air zound perhaps?

Ok, I'm a ficky, 115db wrt to what?

How do you mean 'wrt to what' ? 'dB' is an SI unit, or rather a sub-unit, so
is a defined absolute.

Well I can't find it

http://www.bipm.org/en/home/

http://www.bipm.org/en/si/si_brochure/chapter4/table8.html

"In using these units it is important that the nature of the quantity be
specified, and that any reference value used be specified. These units
are not SI units, but they have been accepted by the CIPM for use with
the SI."

Rob Morley said:

In article <[email hidden]>, Tosspot
[email hidden] says...

Quoted message said:

David Lloyd said:

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

>Steve wrote:
>
>
>>Stolen from gizmondo
>>
>>http://gadget.brando.com.hk/prod_detail.php?prod_id=00451
>>
>>A little compertition for the air zound perhaps?
>
>Ok, I'm a ficky, 115db wrt to what?

How do you mean 'wrt to what' ? 'dB' is an SI unit, or rather a sub-unit, so
is a defined absolute.

Well I can't find it

http://www.bipm.org/en/home/

http://www.bipm.org/en/si/si_brochure/chapter4/table8.html

"In using these units it is important that the nature of the quantity be
specified, and that any reference value used be specified. These units
are not SI units, but they have been accepted by the CIPM for use with
the SI."

Ah, good point, well presented, I didn't think to look under the Non-Si
units 🙁 A barn! What a brilliant unit, I'll be looking for an excuse
to use that...

In news:[email hidden],
Tosspot <[email hidden]> tweaked the Babbage-Engine to tell us:

Quoted message said:

Ah, good point, well presented, I didn't think to look under the
Non-Si units 🙁 A barn! What a brilliant unit, I'll be looking for
an excuse to use that...

To say nothing of the shed. 1 barn = 1.0e+23 sheds :-)

--
Dave Larrington
<http://www.legslarry.beerdrinkers.co.uk>
My liver is evil, and must be punished.

Tosspot said:

Ah, good point, well presented, I didn't think to look under the Non-Si
units 🙁 A barn! What a brilliant unit, I'll be looking for an excuse
to use that...

My favourite usage is to multiply it by a Hubble to get a Hubble-barn.
This is the volume of a straw with cross-sectional area of about an
atomic nucleus, and length equal to the radius of the universe. The
actual value is between 0.5 and 15 litres, depending on what source
you use for the value of the hubble :-)

TL

The Luggage said:

Tosspot said:

Ah, good point, well presented, I didn't think to look under the Non-Si
units 🙁 A barn! What a brilliant unit, I'll be looking for an excuse
to use that...

My favourite usage is to multiply it by a Hubble to get a Hubble-barn.
This is the volume of a straw with cross-sectional area of about an
atomic nucleus, and length equal to the radius of the universe. The
actual value is between 0.5 and 15 litres, depending on what source
you use for the value of the hubble :-)

*boggle*

Tosspot said:

A barn! What a brilliant unit, I'll be looking for an excuse
to use that...

It's about the size of a uranium nucleus, which is very, very large
for a subatomic structure. Supposedly, when some merkin nuclear
physicist types were attempting to split said atom by firing things at
the nucleus one of them observed that hitting a uranium nucleus was
relatively easy because it's as big as a barn.

regards, Ian SMith
--
|\ /| no .sig
|o o|
|/ \|

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Rob Morley said:

In article <[email hidden]>, Tosspot
[email hidden] says...

Quoted message said:

David Lloyd wrote:

>"Tosspot" <[email hidden]> wrote in message
>news:[email hidden]...
>
>
>>Steve wrote:
>>
>>
>>>Stolen from gizmondo
>>>
>>>http://gadget.brando.com.hk/prod_detail.php?prod_id=00451
>>>
>>>A little compertition for the air zound perhaps?
>>
>>Ok, I'm a ficky, 115db wrt to what?
>
>
>How do you mean 'wrt to what' ? 'dB' is an SI unit, or rather a
>sub-unit, so is a defined absolute.

Well I can't find it

http://www.bipm.org/en/home/

http://www.bipm.org/en/si/si_brochure/chapter4/table8.html

"In using these units it is important that the nature of the quantity be
specified, and that any reference value used be specified. These units
are not SI units, but they have been accepted by the CIPM for use with
the SI."

Ah, good point, well presented, I didn't think to look under the Non-Si
units 🙁 A barn! What a brilliant unit, I'll be looking for an excuse to
use that...

After a quick Wikipedia reference, I stand corrected. Although it is a
commonly used unit, it is not in itself an SI unit but it is up for adoption
as such.

http://en.wikipedia.org/wiki/Decibel

Does not 1 Barn = 1 KiloShed. I think that is about right on a volume basis.
:-)

David Lloyd

In article <[email hidden]>, David Lloyd
[email hidden] says...

Quoted message said:

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Rob Morley said:

http://www.bipm.org/en/si/si_brochure/chapter4/table8.html

"In using these units it is important that the nature of the quantity be
specified, and that any reference value used be specified. These units
are not SI units, but they have been accepted by the CIPM for use with
the SI."

Ah, good point, well presented, I didn't think to look under the Non-Si
units 🙁 A barn! What a brilliant unit, I'll be looking for an excuse to
use that...

After a quick Wikipedia reference, I stand corrected. Although it is a
commonly used unit, it is not in itself an SI unit but it is up for adoption
as such.

http://en.wikipedia.org/wiki/Decibel

I wonder why you went to Wikipedia when a link to the definitive
authority had already been posted. Or has Wikipedia wrested control of
the SI from BIPM?

"Rob Morley" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

In article <[email hidden]>, David Lloyd
[email hidden] says...

Quoted message said:

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Rob Morley wrote:
>
> http://www.bipm.org/en/si/si_brochure/chapter4/table8.html
>
> "In using these units it is important that the nature of the quantity
> be
> specified, and that any reference value used be specified. These units
> are not SI units, but they have been accepted by the CIPM for use with
> the SI."

Ah, good point, well presented, I didn't think to look under the Non-Si
units 🙁 A barn! What a brilliant unit, I'll be looking for an excuse
to
use that...

After a quick Wikipedia reference, I stand corrected. Although it is a
commonly used unit, it is not in itself an SI unit but it is up for
adoption
as such.

http://en.wikipedia.org/wiki/Decibel

I wonder why you went to Wikipedia when a link to the definitive
authority had already been posted. Or has Wikipedia wrested control of
the SI from BIPM?

Took one look at foot-noted table and thought "Arrrgh!", so looked for
something that we could all understand.

David Lloyd

In article <[email hidden]>, David Lloyd
[email hidden] says...

Quoted message said:

"Rob Morley" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

In article <[email hidden]>, David Lloyd
[email hidden] says...

Quoted message said:

"Tosspot" <[email hidden]> wrote in message
news:[email hidden]...
> Rob Morley wrote:
>>
>> http://www.bipm.org/en/si/si_brochure/chapter4/table8.html
>>
>> "In using these units it is important that the nature of the quantity
>> be
>> specified, and that any reference value used be specified. These units
>> are not SI units, but they have been accepted by the CIPM for use with
>> the SI."
>
> Ah, good point, well presented, I didn't think to look under the Non-Si
> units 🙁 A barn! What a brilliant unit, I'll be looking for an excuse
> to
> use that...

After a quick Wikipedia reference, I stand corrected. Although it is a
commonly used unit, it is not in itself an SI unit but it is up for
adoption
as such.

http://en.wikipedia.org/wiki/Decibel

I wonder why you went to Wikipedia when a link to the definitive
authority had already been posted. Or has Wikipedia wrested control of
the SI from BIPM?

Took one look at foot-noted table and thought "Arrrgh!", so looked for
something that we could all understand.

You only had to look at one entry in the table, and one footnote, even
if I hadn't already extracted the relevant passage. As it is you went
to an unreliable source and concluded that "it is not in itself an SI
unit but it is up for adoption as such", while the truth is that "these
units are not SI units, but they have been accepted by the CIPM for use
with the SI". I'll shut up now.