[ARSCLIST] Fw: [88sOn78s] Exit Grooves on Shellac and Early Vinyl

[Steven Smolian <smolians@xxxxxxxxx>]

Sending this to the ARSC list.

Steve Smolian

----- Original Message ----- 
From: Jody 
To: 88sOn78s@xxxxxxxxxxxxxxx 
Sent: Thursday, May 19, 2005 2:10 PM
Subject: [88sOn78s] Exit Grooves on Shellac and Early Vinyl


Hi Folks:

I've never been able to find a clear answer on this, though I suspect
it has something to with hardware co-operation on old record changers
(ie. velocity trip).

My question is: Why do electrically recorded shellac discs, and early
vinyl LPs have an exit groove that zig-zags back and forth, when it
spins? Why did they go to a stationery exit groove in the early 60s?
Can anyone accurately/technically answer this.

Much appreciated,

Jody Thornton
(Hamilton, Ontario)





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