. School: a monthly record of educational thought and progress. d at his disposal. The models discussed hitherto have been supposedconstructed of paper or card, and to have indicated thenature of the soHd by giving the plane surfaces containingit, but those constructed of wires and threads havetheir special uses. Large models for class-work maybe made of stouter and rougher materials. I havefound bamboo very useful. Fig. 6 shows the construction of a model to illustrateEucHd XL, 6 (or 8). The board stands for the planeMN. The stout uprights, AB, CD, at right angles to it * This instrument may
. School: a monthly record of educational thought and progress. d at his disposal. The models discussed hitherto have been supposedconstructed of paper or card, and to have indicated thenature of the soHd by giving the plane surfaces containingit, but those constructed of wires and threads havetheir special uses. Large models for class-work maybe made of stouter and rougher materials. I havefound bamboo very useful. Fig. 6 shows the construction of a model to illustrateEucHd XL, 6 (or 8). The board stands for the planeMN. The stout uprights, AB, CD, at right angles to it * This instrument may also be utilised for bringing out theactual arrangement and position of the lines in the figures to thepropositions of an ordinary school course in Solid Geometry, suchas Haywards or that by Hall and Stevens. EDUCATIONAL THOUGHT AND PROGRESS 213 are pieces of bamboo, fitting into holes in the more slender obliques, AE, AD, AF, are bird perchesobtained from a fanciers shop, and kept from slippingby drawing pins ; the lines BE, BD, BF are chalk Fig. 6. marks on the board. When it is not required for use,the rods all easily; come away and may be stored ina drawer, while the board can be placed flat against awall. The model thus fulfils two conditions properfor a class-model: (i) it is of considerable size whenused in class ; (ii) it is easily put away when not simple arrangement has the same have four stout bamboos about four feet in , when lashed at the corners, give a large modelof the tetrahedron. A ring is fastened at the middleof each rod, and a thread through these rings outlinesan octahedron. Other uses of the same apparatus willnaturally suggest themselves. When it. is not wantedthe unloosing of a knot allows the whole to be foldedup flat against a wall. (3) Ii affords manual exercise suitable for all agesand for both sexes. At the debate in Section L at Cambridge inAugust, opened by Sir Philip Magnus, on ManualExercise in its
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