Drawing of ground glass joints with a slight conical taper used for making laboratory glassware. An inner (male) joint is shown on the left side and an outer (female) joint is shown on the right side. The ground glass surfaces are shown with gray shading. By putting them together in the direction of the arrows, they can be joined, usually with a little grease spread on the ground glass surfaces. The inner joint is inserted into the outer joint.

H Padleckas created this image file in March 2006 especially for use in the article "Laboratory glassware" in Wikimedia. H Padleckas 05:28, 29 March 2006 (UTC)

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