How to teach paper-folding and cutting: a practical manual-training aid (1892)
[Litchfield, Norma MacLeod] [from old catalog] · Lebanon, Ohio, March brothers · leaf 82
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… … being considerably longer. The faces of the prismmust correspond in width with the lengths of thesides of the triangle. A modification of the triang-ular prism is shown in the triangular box representedin figure No. ii6. The sides are an inch high, andthe plan is shown in figure No. 117. 8o…
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