11. Instead of polymers, Hunt's device relies on a tiny quartz crystal . 12. At the centre on the front, there is a large, oval quartz crystal . 13. Using quartz crystals the shoe generates electrical current as the wearer walks around. 14. Meacham's circuit included a quartz crystal oscillator and a lamp in a Wheatstone bridge. 15. A local rock shop just obtained some quartz crystals which phosporesce ( and floresce. 16. A number of firms started producing quartz crystals for electronic use during this time. 17. Oxalic acid is also used to clean iron and manganese deposits from quartz crystals . 18. In the 1960s the electronic battery and kept time with a vibrating quartz crystal . 19. The Indian Memorial Museum houses pre-historic Indian pottery, fossils, Quartz crystal and antique glass. 20. Two types of quartz crystals exist : left-handed and right-handed.
