[NJARC] Coherer Filings

[Mike Feher]

That I never tried Al. The majority of commercial coherers that I have are not sealed to vacuum, or otherwise. I had one where the glass was missing but the rods where there and I bought about 10 pieces of 15 inch long glass tubing so I could cut off a little over an inch. Fits perfectly. The OD is 5mm and the ID is 3mm. If you notice, the early EI coherers were not sealed either. Of course the Marconi and the Branly were. My earliest one is an L.E. Knott from 1900 which is also not sealed. The rods fit very snugly inside the glass tube so that none of the fillings can escape. Of course there is a guy on eBay selling coherers that he made (or had made for him), which are sealed, for about $50 each, if you want to go that route. I did buy a few of them 7 years ago just for the heck of it. Just checked and he is still selling them, so look at 311400972601 . 73 - Mike  

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 


-----Original Message-----
From: Al Klase [mailto:ark at ar88.net] 
Sent: Tuesday, March 22, 2016 7:24 PM
To: Mike Feher; NJARC at MAILMAN.QTH.NET
Subject: Re: [NJARC] Coherer Filings

Mike,

How are you at glass blowing, making a T, and sealing the ends, etc.?  I saw a crazy Britt on YouTube who used plastic aquarium tubing.  I still have some glass tubing.  We'll see what happens.

Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 3/22/2016 7:06 PM, Mike Feher wrote:
> I do have glass rods if you need it. Can even cut to any length. 73 - 
> Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
>
> -----Original Message-----
> From: NJARC [mailto:njarc-bounces at mailman.qth.net] On Behalf Of Al 
> Klase
> Sent: Tuesday, March 22, 2016 5:27 PM
> To: NJARC at MAILMAN.QTH.NET
> Subject: [NJARC] Coherer Filings
>
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> Folks,
>
> The recent discussion of the TELIMCO Wireless Telegraph set, reminds me that I have had a coherer demonstration on the back burner for a long time.  I had a reasonably sensitive coherer worked up, but got stalled on the relay etc.
>
> I want to get back to this but I've lost my stuff.  What I need most is an old Canadian five cent piece, one with high nickel content. You'll be able to pick it up with a magnet.  May apply to dimes and quarters as well.  Check your piggy bank, please.
>
> Al
>