. The London, Edinburgh and Dublin philosophical magazine and journal of science . with film, which is easily done for all the facesbut one. The curvature of the hexagonal film on the twosides of the plane of its six long diagonals is beautifully shownby reflected light. I have made these 36 arcs by cuttingtwo circles, 6 inches diameter, of stiff wire, each into 18 partsof 20° (near enough to 19° 28). It is easy to put themtogether in proper positions and solder the corners, by aid ofsimple devices for holding the ends of the three arcs togetherin proper positions during the soldering. The cir
. The London, Edinburgh and Dublin philosophical magazine and journal of science . with film, which is easily done for all the facesbut one. The curvature of the hexagonal film on the twosides of the plane of its six long diagonals is beautifully shownby reflected light. I have made these 36 arcs by cuttingtwo circles, 6 inches diameter, of stiff wire, each into 18 partsof 20° (near enough to 19° 28). It is easy to put themtogether in proper positions and solder the corners, by aid ofsimple devices for holding the ends of the three arcs togetherin proper positions during the soldering. The circular cur-vature of the arcs is not mathematically correct, but the errordue to it is, no doubt, hardly perceptible to the eye. 15. But the true form of the curved edges of the quadri-lateral plane films, and of the non-plane sufaces of the hexa-gonal films, may be shown with mathematical exactness bytaking, instead of Plateau^ skeleton cube, a skeleton squarecage with four parallel edges each 4 centimetres long: andthe other eight, constituting the edges of two squares each.
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
