[GreenKeys] Unusual telegraph device

[Alf Fisher]

I like Jim, think its a Hellschreiber like device.
The so-called peckers are effectively scanning across the width of the tape 
as it is pulled through the roller.
There is a slip ring that has a wire connected and the whole of the pecker 
assembly is on an insulating material like bakelite.

I think the governed motor must be inside the box that has the terminals on 
top.
The drive from the motor is a rod that passes lengthwise between the plates 
and carries a spur gear to drive the pecker rotor, a worm gear to drive the 
feed roller and a skew gear to drive the distributor.

I recall years ago I used a Muirhead D-649 Mufax machine for printing out 
weather charts.
See: http://www.r-type.org/addtext/add121.htm
The rolls of paper were very damp and came in sealed polybags to keep the 
moisture in.
The helix rotation speed could be set at 60, 90 or 120 rpm and contacted the 
writing edge with the moist chemically treated paper passing between the 
two.

Alf, G3WSD



-----Original Message----- 
From: Richard Knoppow
Sent: Monday, April 16, 2018 4:21 AM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Unusual telegraph device

    From the language on the instructions its British.
Accumulator for battery and earth for ground are tip offs.

On 4/15/2018 4:49 PM, Jim Haynes wrote:
>
> Seems like a good guess.  I'm aware of fax machines that used a wet
> chemical paper, but in those the roll of paper came wet and had to be
> kept in a humidor.  Wetting the paper just before use seems like a
> much better idea.
>
> On Sun, 15 Apr 2018, hwhall at compuserve.com wrote:
>
>> I'm thinking the paper wetting isn't for gum but to activate chemicals
>> soaked into the paper & make the paper slightly conductive. Note that the
>> schematic the roller & pecker are electrically connected, and the paper
>> presumably moves between them, current might have caused chemicals to 
>> react
>> to leave marks on the paper.
>>
>> Wayne
>> WB4OGM

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

2002-to-present greenkeys archive: 
http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: 
http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: 
http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html