Here I present: Fred Gissoni, “Using the Cranmer ABACUS for the Blind”, 1964, PART THREE (III).
INTRODUCTION.
The Cranmer Abacus’ is often used in combination with a Taylor mathematical slate.
TAYLOR MATHEMATICAL SLATE.
In the mid 19th century Reverend William Taylor developed this device to teach mathematics to blind students. The Taylor mathematical slate consists of an aluminum frame and a pair of metal pegs or type with the pattern. The frame has rows of openings each set out as an eight pointed star. The pegs could therefore be placed in the frame in one of eight orientations which could be used to represent numbers, letters, or signs. Math can be composed in linear, vertical, or algebraic notation.
