3営業日以内に発送≪新品未開封品≫「サンドペンデュラム」は、振り子のオブジェです。一定のリズムで前後左右に振れるオモリの先端が砂の上に触れて残していく跡（リサージュ曲線）は二度と同じ模様を描きません。
「振り子の周期（振子が1往復する時間）は、振れ角（振れ幅）によらず、糸の長さのみに依存する」という性質＝「振り子の等時性」は、ガリレオ・ガリレイによって発見されました。16世紀後半、薄暗いピサの大聖堂の中で揺れる、火の灯ったランプを見て気が付いたと言われています。
「サンドペンデュラム」においても振り子の等時性は見られ、出来るだけ振り子の糸が長い（＝サンドペンデュラムが高い）方が、振れ角も小さく、周期も大きくなります。よりゆったりとした振り子の動きが見られます。ちょっとだけ、「フーコーの振り子」の動きも見られるかもしれません。
振り子の等時性は、振れ角が小さい場合（10度程度）に限られます。例えば、振り子の糸の長さが45cmだった場合、振れ角10度の時の振れ幅は、tan10°x0.45x2=0.159、 約16cmとなります。（糸長さが50cmなら、振れ幅17.6cmが「振り子等時性」の限界）
商品高さ：約55cm 主な
| Product # | B095363XBF |
|---|---|
| Weight | 1200 g |
| Product package size | 55 x 28 x 3 cm |
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