| 31. | In the past, scientists constructed their own laboratory apparatus prior to the ubiquity of interchangeable ground glass joints.
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| 32. | Firstly, the powder is actually ground glass typically from a single manufacturer who supplies an extensive color palette.
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| 33. | The lens was made up of 666 hand-ground glass prisms all focused toward three sets of double bullseyes.
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| 34. | Some kite fighters pass their strings through a mixture of ground glass powder and glue, which is legal.
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| 35. | To take the photograph, the photographer pulls back the ground glass and slides the film holder into its place.
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| 36. | A fiber optic based 35 mm ground glass to video chip reducer was patented and sold to a competitor.
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| 37. | Round bends of glass tubing with ground glass joints may be used to adjust the orientation of various vessels.
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| 38. | Since the ash has the consistency of ground glass it causes abrasion damage to moving parts such as engines.
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| 39. | In the 16th century a range of glass stains were introduced, most of them coloured by ground glass particles.
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| 40. | Focussing of these plate cameras was by the use of a ground glass screen at the point of focus.
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