SLATES, SLIDE RULES, AND SOFTWARE - TEACHING MATH IN AMERICA
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From the 1890s, American science and engineering students were taught to do routine calculations using a slide rule. Wearing a slide rule in the pocket or on the belt became a symbol of technical expertise. This model, made especially for students, was last used by the electrical engineer Robert H. Wieler (1923-1993).

 

Slide Rule - Click To Enlarge
SLIDE RULE

Some teaching aids have been made by students and their teachers. These are some of the earliest surviving models made by high school teacher A. Harry Wheeler. Wheeler taught in Worcester from the mid-1890s into the 1940s. He and his students made hundreds of paper, plastic, wooden, and string models.  

The other photograph below shows Wheeler and a student in 1937.

Wheeler models - Click To Enlarge
WHEELER MODELS
A. Harry Wheeler and student - Click To Enlarge
A. HARRY WHEELER
AND STUDENT

 

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The Smithsonian Institution's National Museum of American History, Behring Center