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Jolly’s Apparatus, mounted on an elegantly polished wooden stand with metal base,  Jolly air bulb made of borosilicate glass is mounted on a wooden frame, Complete with Rubber tubing & set of two glass tubes, supplied without mercury. Jolly’s Apparatus, mounted on an elegantly polished wooden stand with metal base,  Jolly air bulb made of borosilicate glass is mounted on a wooden frame, Complete with Rubber tubing & set of two glass tubes, supplied without mercury.