Boxwood Harrow Mark Reducer slide rule by E.S.A.,
- Made:
- London
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Boxwood Harrow Mark Reducer slide rule by E.S.A., London.
The Harrow Mark Reducer is a slide rule that was designed in 1875 by W. D. Bushell, a teacher at Harrow School in north London. It was designed for use in the caluclation of weighted marks in school eaminations.
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