طريقة استخدام البندول الكاشف Archives - العالم الفلكي محمود فرح

ما هي طريقة استخدام البندول الكاشف

يعد البندول الكاشف عبارة عن قطعة مصنوعة من خشب أو معدن أو غيرها يتم تعليقها من طرفها العلوي.. ومن الممكن أن تكون على شكل كرة أو مثلث أو شكل حلزوني […]

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