🚀 go-pugleaf

In article <754@riccb.UUCP> jmc@riccb.UUCP (Jeff McQuinn ) writes:
>> 
>> Conversely, there are materials which are called "thixotropic" (spelling?),
>> which are solids if stressed slowly and liquids if stressed quickly. A good
>
>Incidently; Van Nostrum flatly states that glass is a solid.  It sometimes
>shows properties like those of a super-cooled liquid.  
>
>						Jeff McQuinn just VAXing around
  This is a second hand story - take it as you will!
An old trick, used by experienced glaziers on their apprentices was based on 
the property of glass to micro-fissure when scrached and then "heal" in short
order.  The glazier, by way of example, would scribe a complex line on a piece
of glass and snap it cleanly in two.  He would then hand it to the aprentice
to scribe and then take it back to examine it while talking at length of the
delicate ART of glass cutting.  When handed back to the apprentice for snaping,
the piece of glass would break anywhere but where it was supposed to.

I have also heard that the large store front windows on the downtown Chicago
stores (Marshall Fields, etc.) would be removed and rotated every few decades
to prevent breakage because the glass would get thicker at the bottom and 
thinner at the top.

	From the rumor mill:

----------------------
Ben Liberman

ihnp4!chinet!magik   or   ihnp4!homebru!magik