[78-L] Hmm Dept.

[David Lennick]

Well, Jeff Healey could identify take numbers on Diamond Discs, and they were 
invisible as far as he was concerned....

dl

On 2/6/2013 3:59 PM, Cary Ginell wrote:
>
> But he says it is 1 cm long. How can you tell how long it is by tapping on the disc?
> CG
>
>> Date: Wed, 6 Feb 2013 21:11:09 +0100
>> From: goldenbough at arcor.de
>> To: 78-l at 78online.com
>> Subject: Re: [78-L] Hmm Dept.
>>
>>
>> The invisible crack may sound when you tap on the rim of the disc while you
>> let the record rest on your fingertips around the center hole.
>>
>> Benno
>>