An Easily Constructed Octahedron Model A model of an octahedron useful in teaching coordination chemistry can he essily made by the following illustrated steps. 1) Fold a piece of paper (at least twice as long as i t is broad) lengthwise, down the center. 2) The left hand top corner A is folded inwards so that it falls on the central meme and the resulting fold passes through the right hand top corner B. After unfolding, the new crease is seen to meet theleft edge of the paper a t P. 3) The lengths AD and AQ are thrice and twice A P , respectively. The lines DC, PP', QQ' me perpendicular to the central crease and the portion below DCis removed. 4) Folds are made inwards as shown: viz, AP', P'Q, PQ', Q'D, QC. 5) The paper is now cut along the central crease, down from the top to half its length and upwards to one-sixth of its lengt,h from ihe hottom. 6) It is now folded such that P' is forced on P and C i s forced on D, and the remaining folds are easily completed and the edges pasted.
Volume 48, Number
I,
January 1971
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59
