Re: Invar low expansion metal

<Havriliak@xxxxxxx> wrote in message
news:1126905471.491937.86980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Boy is that stuff expensive

Interesting -
a few years ago I bought an old surveying subtense bar which contains two
invar rods holding surveying targets set precisely 2m apart. It cost me
little more than 2x the currently listed cost of the invar rods, and I had
no idea that invar was in this league, nor that invar was officially graded
as "Harmful".

--
M Stewart
Milton Keynes, UK
http://www.megalith.freeserve.co.uk/oddimage.htm





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Relevant Pages

  • Re: Invar low expansion metal
    ... > a few years ago I bought an old surveying subtense bar which contains two ... > invar rods holding surveying targets set precisely 2m apart. ... > little more than 2x the currently listed cost of the invar rods, ... I didn't know it was harmful either! ...
    (sci.astro.amateur)
  • Re: Invar low expansion metal
    ... >> a few years ago I bought an old surveying subtense bar which contains two ... >> invar rods holding surveying targets set precisely 2m apart. ... >> little more than 2x the currently listed cost of the invar rods, ... I didn't know it was harmful either! ...
    (sci.astro.amateur)