Historical Tools And Instruments

noun a tablet covered with a sheet of horn for writing on

• The hornbook was a popular educational tool used in colonial America.
• I found a hornbook in the attic that belonged to my great-grandfather.
• Hey, check out this cool hornbook I scored at the antique shop!
• The old dictionary was like a hornbook for learning new vocabulary words.

noun a plural form of the noun abacus, which is a calculating tool used for arithmetic calculations

• The student used abaci to solve complex mathematical problems in the classroom.
• I found some old abaci in my grandparents' attic.
• Hey, check out these cool abaci I found at the flea market!
• The abaci of history continue to shape our understanding of the past.

noun A person who uses an abacus for calculation.

• The abacist used an ancient counting tool to perform calculations.
• The abacist is really good at doing math in his head.
• I heard that abacist is a human calculator.
• She's like an abacist when it comes to organizing her thoughts.