[time-nuts] SC Cut

[Richard (Rick) Karlquist]

The SC cut crystal is generally credited to Jack Kusters
(of HP) and Errol Ernisse.  The story was something like
Errol proposed the concept and Jack actually made the
first one, which was quite non-trivial.
Jack used to joke that "SC" stood for Santa
Clara.  (Jack and I worked for the old HP Santa Clara
Division).  Jack, along with Charles Adams and Jim Collin,
produced 100's of thousands of SC cut crystals and taught the
rest of the industry how to make them.  Jack was very
particular about making them "correctly" in terms of
angle of cut, etc.  He was really proud of his X-ray
system that was accurate to 2 arc-seconds.  This was
instrumental in being able to actually fabricate "true"
SC cut crystals.

Rick Karlquist N6RK

On 9/11/2012 9:38 AM, Bob Camp wrote:
> Hi
>
> The answer to any crystal cut origin question is always a bit murky. People
> have been chopping quarts in strange ways for quite a while. Certainly the
> first to popularize the SC cut were the boys at HP.
>
> One common answer to these questions is "it's in Heising":
>
> http://books.google.com/books/about/Quartz_crystals_for_electrical_circuits.
> html?id=2-4gAAAAMAAJ
>
> Of course a *lot* depends on just how much you read between the lines....
>
> The Wikipedia article is a bit odd. The crystal oscillator industry was
> quite crowded long before Statek came along. There is a *lot* of history
> missing there...
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Pete Lancashire
> Sent: Tuesday, September 11, 2012 12:00 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] SC Cut
>
> Curious who came up with the SC cut first ?
>
> The well done Wikipedia page
>
> http://en.wikipedia.org/wiki/Crystal_oscillator
>
> doesn't say
>
> -pete
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