Engineered quartz countertops are the focus of website Quartz-Countertops.org. Website visitors can learn about the features and benefits of engineered quartz, as used for countertop surfaces. Links to quartz countertop manufacturers are included on the website.
Atomic clocks are featured on AtomicClocks.us. So-called atomic clocks keep time by means of quartz crystals and periodic radio-controlled synchronization with the NIST atomic clock. Website visitors can compare radio-controlled clocks offered by selected atomic clock makers. Atomic clock dealers are listed, as well as educational resources discussing the history of atomic clocks.
Wall clocks are featured on the WallClocks.us website, which defines wall clocks in terms of their usefulness and beauty. Learn about the various types of wall clocks, from battery-powered quartz movement clocks to digital and pendulum-driven movement clocks. Compare wall clocks for home or office from selected wall clock manufacturers. Site features links to shops that sell wall clocks and to information about collecting clocks.
Watches are basically portable clocks that were originally developed in the 16th century, after Peter Henlein invented the mainspring. They tell the time of day or night and come in all sizes and shapes. Some watch designs are plain and simple while others are ornate and even jewel-encrusted. Until the 20th century, watches had analog displays and many clockwork parts. More recent developments include electric watches with quartz crystals and electronic watches with digital displays.