1. The platen had a spiral groove on its surface, like the disk. 2. It may be smooth or have spiral grooves ( striae ). 3. Sculptured with fine spiral grooves over the whole surface, 20-25 on body whorl. 4. The longrifle is an early example of a firearm using rifling, spiral grooves in the bore. 5. If the machinist isn't careful, he can also leave spiral grooves like those on an LP record. 6. The spiral groove caused by a parasitic vine was often imitated by its maker if not present. 7. The operculum itself bears a deep, spiral groove and is also granular on the convex outer surface. 8. The sculpture consists of 5-7 rounded, equidistant, spiral cords separated by deep spiral grooves of about equal width. 9. "Rifling " refers to the act of adding spiral grooves to the inside the barrel of a firearm. 10. They are both found deep to the triceps muscle and are located on the spiral groove of the humerus.
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