Throwback Thursday Object: An Early Math Aid
Our object this week is a wooden frame with small compartments in a twenty by thirty grid. There are metal types with a raised Arabic numeral on the end that fit into the “cells.” Originally called an Arabic Slate, this style of math aid was developed in Paris, France in the 19th century. One source from 1910 called it the Paris Method. This particular model, known as an Arithmetic Type Frame, was developed in 1936 at APH as an instructional aid for working problems in long division, multiplication, subtraction, and addition. The supplied lead type was called Philadelphia Great Primer Type. In 1959, APH introduced the Texas slate to replace the Arithmetic Type Frame.
Photo Captions: First Photo: The eight inch by thirteen inch Arithmetic Type Frame had 600 “cells.”
The second image shows you a close-up of the raised number types.
Micheal A. Hudson