How to teach paper-folding and cutting: a practical manual-training aid (1892)
[Litchfield, Norma MacLeod] [from old catalog] · Lebanon, Ohio, March brothers · leaf 81
F.&.H ( i X V \> !! 1 !s {j n_g.£.,/s- are not necessarily equilateral. The triangles maybe right-angled, isosceles, or irregular. In each casethe three sides of the prism will be oblongs, but not … prisms of the same size. Each of the three sides ofthe triangular bases must have an oblong that willagree with it in width. Examine figure No. 115, and PRISMS. 79 no further explanation will be needed. The plan fora right-angled triangular prism is here shown. Twoof the sides of the triangle are…
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