On Fri, 26 Dec 2008 04:45:43 -0500, "Rob H." wrote:

I plan to go back to the usual schedule next week:

http://55tools.blogspot.com/


1495. Height gages. I'm going to guess that they were used by pattern
makers for holding "shrink rules" -- rules used for laying out
patterns that are graduated with scales proportional to the shrinkage
of the metal to be cast. Using the proper shrink rule allows the
pattern maker to work to the dimensions of the cooled casting without
calculating the shrink for each feature.

--
Ned Simmons