Norma, the Carpenters Square, is completely visible in latitudes South of 30 degrees North from April - June.
Norma was invented by Lacaille during his stay at the Cape of Good Hope between 1751 and 1752.
Norma was named by Abbé Nicolas Louis de Lacaille. He called it "Norma et Regula" (the Level and the Square), but this awkward name was mercifully shortened to its modern form.
