Excursion in mathematics
By: by Ernst R. Breslich ...
Publisher: The Orthovis company
Published: 1938
Place of publication: Chicago
Language: eng
Number of pages: 47
Subjects: Geometry, Solid.
Notes: Two ortho-scopes in pocket mounted on lining-paper.
"The book has developed from experiments devised to train pupils in spatial imagination. It aims to supplement and strengthen the teaching of geometry in the secondary school from the seventh grade on."--Author's note.