| 41. | Maudslay developed the first industrially practical screw-cutting lathe in 1800, allowing standardisation of screw thread sizes for the first time.
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| 42. | These continuous screw-thread jars were designed with a bead between the screw threads and the shoulder as a sealing surface.
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| 43. | Acrow props are adjustable for height by a large diameter screw thread, formed on the outside of the tube itself.
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| 44. | This causes the screw threads to pull the two pieces of wood tightly together as the screw is fully tightened.
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| 45. | This prevents stripping damage to the screw threads, at the expense of possible damage to the recess in the screw head.
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| 46. | Note : In countries other than the United States and Canada, the ISO Metric Screw Thread System is primarily used today.
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| 47. | The focus is on the inherent qualities of screw thread : it can act as both a line and a link.
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| 48. | Joseph Whitworth's screw thread measurements were adopted as the first ( unofficial ) national standard by companies around the country in 1841.
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| 49. | Carved screw threads on tools and carvings with beards found in settlements on the Canadian Arctic islands show contact with the Norse.
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| 50. | The braking force of the actuator varies with the angular pitch of the screw threads and the specific design of the threads.
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