Historical clue formulations

• One might be used in math class or studied in history class — 2024-12-07
• Minos or Midas — 2024-08-23
• Stick around school — 2022-01-15
• Side of many a protractor — 2019-07-30
• Odysseus, to Ithaca — 2019-03-13
• It helps keep things straight — 2017-09-03
• Aid in drawing straight lines — 2015-03-16
• Stick in a school desk — 2014-05-11
• Viceroy, e.g. — 2010-12-05
• 12" stick — 2010-06-07
• Kaiser or czar — 2009-03-10
• It's made to measure — 2007-06-23
• Sovereign — 2006-05-08
• 12" stick — 2006-01-30
• Sovereign — 2005-06-15
• Pencil box top, often — 2005-05-15
• Czar or king — 2005-04-25
• Schoolbag item — 2005-03-10
• Drawing help — 2004-09-12
• King or czar — 2003-12-29
• Monarch, for one — 2002-11-17
• Makeshift punishment tool — 2000-08-02
• It's for good measure — 1999-08-01
• What "Henry" means, literally — 1999-07-16
• Makeshift punishment device — 1999-01-24
• Makeshift punishment device — 1998-11-07
• Mars, to Aries, in astrology — 1997-07-13
• Schoolbag item — 1997-04-06
• 12-inch stick — 1997-03-10
• King or queen — 1997-01-27
• Desk item — 1996-07-14
• School tool — 1996-05-05
• Overlord — 1994-02-11