[GreenKeys] Suggestions for telegraph demo...

[COURYHOUSE at aol.com]

a block of   wood.... some  tin can material   two  mails and a  bunch of  
wire...
 
see the how and why  book of  electricity!
 
hey  worked  for me in  3ed  grade!   it  was..... amazing!
and... here is a pdf...  if  you want to sign  up  otherwise   do a  
graphics  screen capture and it  looks  nice  
 
see page  42!!!!!!!  and....  put  more   turns  of  wire....    you hold 
the key down  with  that big  ass dry cell    you  can flame the   coils! 
 
http://www.scribd.com/doc/77191405/How-and-Why-Wonder-Book-Oectricity-The-Je
rome-J-Notkin-Sidney-Gulkin-Robert-Patterson-Charles-Bernard
 

Ed#    _www.smecc.org_ (http://www.smecc.org)  
 
 
In a message dated 6/9/2013 2:43:51 P.M. Mountain Standard Time,  
scottjohnson1 at cox.net writes:

 
How  about  a small speaker with limited compliance, such as a cheap 
tweeter  or transistor radio speaker? 
Scott  W7SVJ 
 
 
From:  greenkeys-bounces at mailman.qth.net 
[mailto:greenkeys-bounces at mailman.qth.net]  On Behalf Of Derek Cohn/WB0TUA
Sent: Saturday, June 08, 2013  9:10 PM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys]  Suggestions for telegraph demo...

 
 
Hi  Everyone,
 

 
This  year, I'm once again doing a demo for a large group of high school 
seniors who  will be entering the Univ. of Missouri - St. Louis IT program in 
the  fall.  There will be 33 students in this year's  group.
 

 
After  about 1 hour of my 2 hour window, I begin to lose the attention of 
the  students which is normal and I want to make more of my presentation  
interactive with the students building their own telegraph circuit.  I  have 
found a source of reasonably priced hand keys (the cheapie plastic ones  and I 
can add a switch to serve as the circuit closer).  However, I need  
something to serve as the sounder.  I'm not aware of anyone who makes  sounders 
anymore.
 

 
In the  past, I have heard of people using noisy relays (not actual 
telegraph relays,  but automotive or other type) that will click.  It's not 
critical  that the device work well since the students won't know the code and  
won't be able to copy a message.  I just need to demonstrate the  principle of 
how the technology works.  Can anyone suggest a relay or  other device that 
the students can use?  I looked at Tom Perera's web  site where you can wind 
your own sounder but I don't think that will work in  the time frame I 
have.  Whatever I use, will have to be powered from  simple batteries.
 

 
Any and  all suggestions welcome!
 

 
73,

 
Derek  Cohn
Amateur Radio Station - WBØTUA
Morse Telegraph Club - Office UD,  Sine  DJ



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