Prof Calvert's page reminds me of John Savard's home page: http://www.quadibloc.com/ http://www.quadibloc.com/ -- I ran across this back when I first got into s

Prof Calvert's page reminds me of John Savard's home page: http://www.quadibloc.com/ http://www.quadibloc.com/ -- I ran across this back when I first got into slide rules, but there is a lot of other good stuff there too.