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Scott Cram
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Thanks to Google's new magazine archives, I've been having some fun finding articles and ads in old magazines. Here are some that are perfect for the "Magical Equations" section:

Knight's Tour (Popular Mechanics, April 1922) - This version uses a crib sheet

Day of the Week For Any Date This Year (Popular Science, May 1939) - This is a way to set up a simple code on your watch that, without pressing a single button, will allow you to determine the day of the week for any day in the current year (the particular markings shown in the article worked for 2006, and will work again in 2017.) I love the thinking behind this approach!

Do-Them-In-Your-Head Navigation Tricks (Popular Mechanics, September 1965) - Mental math shortcuts for boating. You can quickly determine distance error of an X-degree course change, visibility of the horizon, and water level.

Abel Stroock's Date/Day of Week Formula (Popular Science, April 1961) - This unusual date formula only requires 2 variables as input to determine the day of the week. The catch? You have to know how far into the year the date in question is, such as April 15th being the 105th day of the year (106th in a leap year).

Twenty Centuries Covered In New Calendar (Popular Mechanics, May 1916) - This ingenious 5-column, 7-row calendar covers the day of the week for the years 100-2100!
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Profile of brandes
Scott cram,
thank for share, I really interesting with knight's tour trick since I watch it on one of indonesian tv programmes
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Profile of wulfiesmith
Scott ...
thanks for sharing ... you are the man.

regards, wulfiesmith
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