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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