[time-nuts] Shortt Clock Recent Measurements

Jim Lux jimlux at earthlink.net
Tue Dec 10 23:55:21 EST 2013


On 12/10/13 5:57 PM, Don Latham wrote:
>
>
>> I always thought invar was the magic metal. Quartz rod? You can get
>> those
>> at some reasonable cost?
> 12 mm dia fused qtz, about $10 per ft, so under $40 to get going,
> assuming 4 or 5 to learn how to do it right. It does break...
> 12.7 mm dia Invar 1 m long is $530   Amazing, and quartz is better (A
> single crystal would cost a pretty penny. I'm not sure a crystal that
> long can be drawn using a zone furnace). Pyrex is also available.
> These are quick 'net prices.
>

John Strong's book tells how to make thin high-q fused silica fibers 
with an appropriate burner.  Just the thing for your torsion balance, 
etc. back in the day when a self respecting experimental physicist built 
their own equipment.



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