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... PUBLIC AMITUSEMENTS. ROYAL POLYTECHNIC INSTITUTION.- I)urln, Lent the DISSOLVING ORRERY Will be exhibited on the mornings of Wednesdays and Fridays, whet the Theory of Coniet- ansl oflher Celestial Phenomena will be explained and illustrated by Diagraim-. At work daily, a complete arrangenient of COTTlNi SPINNING MACHINERY, consisting of a Carding, Roving, and 8pinning Frame. Cary's new ...