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2. Electric clock - Wikipedia

   en.wikipedia.org/wiki/Electric_clock

   These keep time by counting the oscillations of a calibrated tuning fork with a specific frequency. These were only made in battery-powered form. Battery-powered clocks have been made using the schemes above with the obvious exception of a synchronous movement. All battery-powered clocks have been largely replaced by the lower cost quartz movement.

3. Telechron - Wikipedia

   en.wikipedia.org/wiki/Telechron

   The electric clock market grew rapidly in the 1930s, and Telechron's patented power interruption indicator gave his clocks an advantage over competing synchronous clocks, but by the 1950s battery-operated clocks that weren't dependent on the power grid took market share, and in the 1960s the quartz clock replaced synchronous clocks.

4. Skeleton clock - Wikipedia

   en.wikipedia.org/wiki/Skeleton_clock

   Nowadays the term skeleton clock is also used to describe modern skeleton clocks for wall. Unlike the 18th century skeleton clocks most of those contemporary timepieces are powered by the battery-operated quartz mechanism. The quartz movement used is a low cost, mass produced, plastic mechanism of no decorative value.

5. Hermle Clocks - Wikipedia

   en.wikipedia.org/wiki/Hermle_Clocks

   Hermle manufactures mechanical mechanisms, battery operated mechanisms, accessories such as dial, pendulums, weight shells, and do-it-yourself clock kits as well as finished clocks. Hermle is a manufacturer that sells to the wholesale industry and operates in over 80 countries with offices in Germany and the United States , since 1977, as ...

6. 8 white noise machines for better sleep - AOL

   www.aol.com/news/8-white-noise-machines-better...

   It is powered by either AC or USB and you can adjust the volume with simple up and down buttons. This white noise machine has a 4.7-star average rating from over 6,460 reviews on Amazon. Pure ...

7. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   In nearly all quartz clocks and watches, the frequency is 32 768 Hz, [1] and the crystal is cut in a small tuning fork shape on a particular crystal plane. [2] This frequency is a power of two ( 32 768 = 2 15 ), just high enough to exceed the human hearing range , yet low enough to keep electric energy consumption , cost and size at a modest ...