On Apr 16, 10:20 am, John from Detroit wrote:
N2EY wrote:
Yes, but there were several reasons for the normally-energized series
line systems.

Another thing is that telegraph "lines" might indeed be a single wire..
Using the Ground as the "Return" for the loop

It is my understanding that many of them were. Besides the savings in
wire and insulators, a ground-return system could actually be lower
resistance than a double-wire system if the "made grounds" at the ends
of the lines were very good.

Of course such a line is more vulnerable to noise, but since the wire
telegraph was a digital system the nouse would have to be considerable
to have any effect.

73 de Jim, N2EY

N2EY wrote:
On Apr 16, 10:20 am, John from Detroit wrote:
N2EY wrote:
Yes, but there were several reasons for the normally-energized series
line systems.

Another thing is that telegraph "lines" might indeed be a single wire..
Using the Ground as the "Return" for the loop

It is my understanding that many of them were. Besides the savings in
wire and insulators, a ground-return system could actually be lower
resistance than a double-wire system if the "made grounds" at the ends
of the lines were very good.

Of course such a line is more vulnerable to noise, but since the wire
telegraph was a digital system the nouse would have to be considerable
to have any effect.

That thing about noise reminded me of a story about a severe magnetic
storm that happened in the 1880s or thereabouts. Currents induced into
telegraph lines were so strong that things caught fire in telegraph
offices as well as simply knocking them offline.

--
David Griffith
--- Put my last name where it belongs

David Griffith wrote:
N2EY wrote:
On Apr 16, 10:20 am, John from Detroit wrote:
N2EY wrote:
Yes, but there were several reasons for the normally-energized series
line systems.
Another thing is that telegraph "lines" might indeed be a single wire..
Using the Ground as the "Return" for the loop

It is my understanding that many of them were. Besides the savings in
wire and insulators, a ground-return system could actually be lower
resistance than a double-wire system if the "made grounds" at the ends
of the lines were very good.

Of course such a line is more vulnerable to noise, but since the wire
telegraph was a digital system the nouse would have to be considerable
to have any effect.

That thing about noise reminded me of a story about a severe magnetic
storm that happened in the 1880s or thereabouts. Currents induced into
telegraph lines were so strong that things caught fire in telegraph
offices as well as simply knocking them offline.


Friend of mine hooked a very high impedance volt meter to his long wire
antenna one storm and got some very interesting voltmeter readings

Several volts (As in 3 digits) as I recall.. Of course it did not take
much current to ground it out but it was amazing the amount of voltage
on that wire.

My Long wire is DC-Grounded so I don't see that.