Indeed, the Drakes are 25 KC per revolution. As I recall, my R4B also had a marker generator that went off every 25 KC, when enabled. 
--
Buddy Brannan, KB5ELV - Erie, PA
Phone: (814) 860-3194 or 888-75-BUDDY



On Sep 20, 2010, at 11:08 PM, Danny Dyer wrote:

> Hi Edd, thanks for your rejoinder to Mikes' message, I didn't see yours 
> until just now. I've sent them both to Jack.
> ----- Original Message ----- 
> From: "Ed Malmgren" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, September 20, 2010 11:00 PM
> Subject: Fw: Making Braille Dials
> 
> 
>> Don't know if this made it through.
>> Ed  K7UC
>> ----- Original Message ----- 
>> From: "Ed Malmgren" <[log in to unmask]>
>> To: "Mike Duke, K5XU" <[log in to unmask]>
>> Sent: Monday, September 20, 2010 8:04 PM
>> Subject: Re: Making Braille Dials
>> 
>> 
>>> I had the Drake twins for many years long ago but no Braille skirts.  If I
>>> remember right there is 25 revolutions of the big knobs, frequency and I
>>> just used the Xtal calibrator as markers which must have worked pretty 
>>> well
>>> so that may help if no marked skirts. On my job I made Braille scales to 
>>> go
>>> under the pots, knobs  and such as that but I don't remember how for sure.
>>> I think I used a compass but can't remember a hundred years back.    I 
>>> used
>>> old flexible talking book records for the material which don't wear off 
>>> the
>>> dots.  Something to think about.  73
>>> Ed  K7UC
>>> ----- Original Message ----- 
>>> From: "Mike Duke, K5XU" <[log in to unmask]>
>>> To: <[log in to unmask]>
>>> Sent: Monday, September 20, 2010 6:36 PM
>>> Subject: Making Braille Dials
>>> 
>>> 
>>>> I remember reading in Braille Technical Press about how to make
>>>> Braille dials using a stylus tied to a string, the other end of which
>>>> was anchored to the center of a piece of plastic such as a coffee can
>>>> lid.
>>>> 
>>>> My attempts at creating them were pretty disastrous, even after Fred
>>>> Gassoni reminded me of the technique during a visit to Jackson about
>>>> 20 years ago.
>>>> 
>>>> I forget who made those dials for the Drakes. I saw one T4X that had
>>>> been fitted with them, and it was amazing to be able to read the
>>>> analogue dials as good as any other ham.
>>>> 
>>>> I also once saw a Heath HW16 that a guy had modified with a Braille
>>>> dial for his wife. They were trying to sell it after she had upgraded
>>>> to General, and did their best to persuade me to buy it. I did not,
>>>> because I had already spent my radio budget. I don't know whatever
>>>> became of that rig, and I have always wished I had gone ahead and
>>>> bought it. Now, of course, I need an HW16, or any other additional rig
>>>> for that matter, like I need another hole in my head!
>>>> 
>>>> 
>>>> Mike Duke, K5XU
>>>> American Council of Blind Radio Amateurs
>>>> 
>>>