[time-nuts] Vintage Quartz Crystal Manufacturing

Alan Melia alan.melia at btinternet.com
Sat Nov 26 14:46:45 EST 2016

Hi agn Adrian .....quote from Wireless for the Warrior

"Wireless Set No. 7 was a mobile transmitter/receiver developed in 1935. 
Use: communication between tanks. Frequency range 1.875-5MHz. MO/crystal 
control. RF output 5W. R/T and MCW. Range 3-5 miles. Unusual shape to fit in 
the bulge of a tank. Only a limited number were produced. Replaced by No. 9 


----- Original Message ----- 
From: "Adrian Godwin" <artgodwin at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, November 26, 2016 12:40 PM
Subject: Re: [time-nuts] Vintage Quartz Crystal Manufacturing

>I bought some old crystals on ebay :
> http://www.ebay.co.uk/itm/122225114483
> Is anyone familiar with this style ? I don't think the quartz is visible 
> in
> the glass section : I imagine that's just an insulator. I think the quartz
> is under a brass disc, with a sping to hold the disc down visible through
> the glass.
> Does anyone know what the reference marked on them "w'less sets No 7"
> refers to ?
> On Mon, Sep 26, 2016 at 6:50 AM, Mark Sims <holrum at hotmail.com> wrote:
>> Can you say "Mr Rogers' Neighborhood?"   I knew you could...
>> He (along with creepy Mr McFeelie) always ran segments on how some item
>> was made.   Geared towards pre-schoolers, but always worth watching.
>> ---------------------
>> Compare the Science channel's new "How Do They Do It" to the older "How
>> It's Made"
>> shows.
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