[Angelo Campanella]

Dear All:

Read my article in ASA's "Acoustics Today" (April '07 edition) about
Antonio and his telephone inventions, 1851-1872.

Angelo Campanella

[Salmon Egg]

On 6/10/07 11:25 AM, in article
, "Angelo
Campanella" wrote:

Dear All:

Read my article in ASA's "Acoustics Today" (April '07 edition) about
Antonio and his telephone inventions, 1851-1872.

Angelo Campanella

Do you have a web reference? Are the dates referring to his life or to his
inventive years?

Bill
--
Iraq: About three Virginia Techs a month

[Jens Rodrigo]

Salmon Egg wrote:
On 6/10/07 11:25 AM, in article
Angelo Campanella wrote:
Read my article in ASA's "Acoustics Today" (April '07 edition) about
Antonio and his telephone inventions, 1851-1872.
Do you have a web reference? Are the dates referring to his life or to his
inventive years?


Antonio Meucci - Telephone Pioneer:
http://www.museocilea.it/typo3conf/e...1f224f9e91f539

Cheers Jens

[Angelo Campanella]

Salmon Egg wrote:
Do you have a web reference? Are the dates referring to his life or to his
inventive years?

The quickest way is to simply Google "Meucci", but here area few directly:

www.garibaldimeuccimuseum.org
http://www.esanet.it/chez_basilio/meucci.htm
www.communicazioni.it/
http://www.italianhistorical.org/MeucciStory.htm
http://www.esanet.it/chez_basilio/antenna.htm
http://www.esanet.it/chez_basilio/meucci_faq.htm

Angelo Campanella

[Angelo Campanella]

Salmon Egg wrote:
On 6/10/07 11:25 AM, in article
, "Angelo
Campanella" wrote:
Read my article in ASA's "Acoustics Today" (April '07 edition) about
Antonio and his telephone inventions, 1851-1872.
Do you have a web reference? Are the dates referring to his life or to his
inventive years?

And here's the Wikipedia reference:

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

Ang. C.

[Angelo Campanella]

Salmon Egg wrote:
On 6/10/07 11:25 AM, in article
, "Angelo
Campanella" wrote:
Read my article in ASA's "Acoustics Today" (April '07 edition) about
Antonio and his telephone inventions, 1851-1872.

Another document, a longer PDF article by Basilio Catania on the same
subject, can be downloaded via.

http://www.museocilea.it/typo3conf/e...1f224f9e91f539

Basilio gives a very good and more detailed summary of the entire
situation:



Angelo Campanella

[H. Wabnig]

On Mon, 11 Jun 2007 01:24:01 GMT, Angelo Campanella
wrote:

Salmon Egg wrote:
On 6/10/07 11:25 AM, in article
, "Angelo
Campanella" wrote:
Read my article in ASA's "Acoustics Today" (April '07 edition) about
Antonio and his telephone inventions, 1851-1872.
Do you have a web reference? Are the dates referring to his life or to his
inventive years?

And here's the Wikipedia reference:

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

Ang. C.
requires coils of really THIN copper wire.
Any historian ever looked at the manufacturers of insulated wires?
At what point in time did the wires become available?


w.
--
soc.culture.austria answering service
proposals and complaints to:

[JohnM]

H. Wabnig wrote:
On Mon, 11 Jun 2007 01:24:01 GMT, Angelo Campanella
wrote:

Salmon Egg wrote:
On 6/10/07 11:25 AM, in article
, "Angelo
Campanella" wrote:
Read my article in ASA's "Acoustics Today" (April '07 edition) about
Antonio and his telephone inventions, 1851-1872.
Do you have a web reference? Are the dates referring to his life or to his
inventive years?
And here's the Wikipedia reference:

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

Ang. C.
requires coils of really THIN copper wire.
Any historian ever looked at the manufacturers of insulated wires?
At what point in time did the wires become available?


w.

Anybody with reasonable skill any time after the discovery of
ironworking could have drawn exceedingly thin copper wire and insulated
it. All you need is iron or steel dies and lubricant for the drawing
process and lacquer for insulation. Copper is very easy to work and is
fairly commonly found on the surface of the ground in remarkably pure
nuggets, some quite large.

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

Wikipedia says wire drawing is nothing new, certainly not an industrial
revolution idea. Apparently stone dies were used at one time, no iron
necessary..

John

[John Boy]

H. Wabnig wrote:

requires coils of really THIN copper wire.
Any historian ever looked at the manufacturers of insulated wires?
At what point in time did the wires become available?

Lacquer suffices and has existed for hundreds of years. It was used in
the 1900's before better synthetic material was common. Look at your
alternator, and there ya be.

[John Boy]

JohnM wrote:

Anybody with reasonable skill any time after the discovery of
ironworking could have drawn exceedingly thin copper wire and insulated
it.

And they did. Look to the telegraph, and earlier to the high-voltage
experiments. Very common stuff.

[Angelo Campanella]

H. Wabnig wrote:
On Mon, 11 Jun 2007 01:24:01 GMT, Angelo Campanella
wrote:
And here's the Wikipedia reference:
http://en.wikipedia.org/wiki/Antonio_Meucci
requires coils of really THIN copper wire.
Any historian ever looked at the manufacturers of insulated wires?
At what point in time did the wires become available?

Meucci was a dedicated tinkerer, following Galileo's recommendation to
"try and try again".

After about 1854, he used commercially available telegraph coils with
pole pieces as transducers and iron telegraph wire for transmission. For
long distance work, he did have a large bobbin of telegraph wire, widely
available by then. Most telegraph wire was uncoated galvanized iron
wire, as it was most easily available in bulk.

Through more tinkering, he found that better sound quality occurred for
wire coated with a graphite inorganic salt slurry. He then tried smaller
wires laid in parallel in place of a single telegraph wire to discover
that the high frequency speech currents purveyed better. He wrapped
relatively thin iron and copper wire with cotton.

This action prompts Basilio Catania, author of most of the modern
research into Meucci's life and times, to conclude that Meucci has
discovered the now well known "skin effect".

As often as not during 1854-1870 inclusive, he used the ends of wire
from a large spool of insulated iron wire for telephone tests and
demonstrations for his Staten Island friends and neighbors. It was
during those activities that he discovered that the received speech
sound was stronger with that bobbin of indulated telegraph wire in
place, as opposed to direct connection. It was so superior that he did
not need to use battery current to energize the transceiver magnet. The
residual magnetism of the iron transducer core was sufficient. This
action was in reality due to the better audio frequency impedance match
offered by the distance bobbin, aka "inductive loading" of a
transmission line.

Basilio Catania, circa 1990, used this specific result to independently
conclude that Meucci was THE authentic inventor of the telephone.

As you may recall Alexander Graham Bell took out the first related
patent on the transmitting speech over a telegraph line in 1876. In
reality, speech transmission was added as an afterthought to a patent
primarily aimed at simultaneous transmission of several telegraph
messages using ac signal of differing frequency for each. The comment
was added that "currents modulated by speech were also possible".

Angelo Campanella

[H. Wabnig]

On Mon, 11 Jun 2007 20:35:32 -0500, John Boy wrote:

JohnM wrote:

Anybody with reasonable skill any time after the discovery of
ironworking could have drawn exceedingly thin copper wire and insulated
it.

And they did. Look to the telegraph, and earlier to the high-voltage
experiments. Very common stuff.

Hmm.
C.F.Gauss and L. Euler talked about using electrical "chains",
(not wires) for telegraphing, and putting the ends of the chains
into the mouth of the receiving telegrapher, because they
noticed that electricity causes a "taste" sensation on the tongue.
At their times obviously wires were not available yet.

w.

[H. Wabnig]

On Mon, 11 Jun 2007 20:35:32 -0500, John Boy wrote:

JohnM wrote:

Anybody with reasonable skill any time after the discovery of
ironworking could have drawn exceedingly thin copper wire and insulated
it.

And they did. Look to the telegraph, and earlier to the high-voltage
experiments. Very common stuff.

Hmm.
C.F.Gauss and W.Weber talked about using electrical "chains",
(not wires) for telegraphing, and putting the ends of the chains
into the mouth of the receiving telegrapher, because they
noticed that electricity causes a "taste" sensation on the tongue.
At their times obviously wires were not available yet.

w.

[H. Wabnig]

On Tue, 12 Jun 2007 16:11:03 +0200, H. Wabnig .... .-- .- -...
-. .. --. @ .- --- -. DOT .- - wrote:



C.F.Gauss and L. Euler talked about using electrical "chains",

Weber, not Euler, sorry