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Aren't there heavily incised lead-out grooves on early German pressings? 
If I recall, lateral Brunswicks from 1919 onward used lead out grooves; 
did others in the US/Canada use them earlier?   I've always assumed they 
were designed to trigger automatic cut-off devices on early wind-ups, much 
as they activated record changer mechanisms and juke boxes later on. 
Dick






Michael Biel <[log in to unmask]> 
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09/10/2008 07:58 PM
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There are three ways record changers get triggered
1) diameter
2) increased acceleration towards the center
3) outward motion of the arm

What we need to determine the necessity of the introduction and the 
change of lead-outs is a chronological listing of record changers and 
juke box mechanisms and which method or methods would trigger them.  For 
example, there is a reason why eccentric leadouts disappeared from LPs 
around 1954.  There is also a reason why most record labels were reduced 
in size in the mid to late 20s.  And there was a reason why eccentric 
leadouts were used in the first place.  Although I think I have the 
necessary literature on changers and the records at hand, I don't have 
the time to do such as study.  But it might make a good ARSC presentation. 


Mike Biel  [log in to unmask]

David Lennick wrote:
> Michael Biel wrote:
>> Dick Spottswood wrote:
>>> Sometimes you can spot altered lead -out grooves on pressings from 
>>> original metals. 
>> I've seen some of them that show both the original and altered lead 
>> out grooves in a mish-mosh, but the needle will follow the new groove 
>> even if your eyes can't.
>>
>> Mike Biel  [log in to unmask]
>
> Okay, what about those double lead-outs on Columbia and Brunswick LA 
> masters? Why was this done on virtually all of them? (Not all..I found 
> a pressing of "Stealin' Apples" that didn't have the extra lead-out 
> and thus didn't chop off the end of the last note. I think it was 
> "Stealin' Apples"..I'll stand corrected if it was another BG side.) 
> Was it because the original locked groove didn't come close enough to 
> the label to trip some shut-offs? In which case, why didn't it matter 
> that Decca stayed far from the label till about 1946? Canadian Deccas 
> had large labels right through that period, although the odd one had 
> the trip groove ending under the label.
>
> dl
>
>