January 19, 2007
Volume 12 No. 3

In This Issue

International Slide Rule Museum


Tessellation Database


International Slide Rule Museum


The International Slide Rule Museum displays scans of over 1000 different slide rules, plus some downloadable instructions and manuals. Other features of the site include:

  • slide rule encyclopedia
  • data of interest to slide rule collectors and educators
  • short tutorial on the use of slide rules, suitable for classroom instruction

Curator Mike Konshak has accumulated several sets (up to 25) of matching slide rules that are available as loaners to teachers wishing to introduce slide rules to students. The only charge is the return postage back to him.



Franco Cocchini offers Tanzzle™, software for exploring tangrams. Choose from four different sets of pieces:

traditional seven piece puzzle
seven piece puzzle with two small triangles, one medium-sized triangle, a square and three quadrilaterals
six piece puzzle with two small triangles, one medium-sized triangle, a small square, a medium-sized square, and one quadrilateral
Number 5
seven piece puzzle with two medium-sized triangles, one square, one large triangle, two parallelograms, and a quadrilateral

Areas of the site:

  • Galleries
  • Download Tanzzle v1.0 including 30 day trial version
  • Download TZLviewer v1.0
  • FAQ

View published patterns and/or submit one of your own:


Request a free license for schools and educational programs:


Tessellation Database


Patrick Snels designed this library of tessellations as a way to learn more about programming. View the works of different tessellation artists by using the pulldown menu at the top of the site. Click the "searching by subjects" link to browse a list of subjects depicted in the catalogued tessellations.

Notice that the name of the tessellation is superimposed on the thumbnail graphic. Selecting it will take you to a page with a larger version of the tessellation.


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