Sounds pretty self explanatory, right? You have to get up, position two thumbs on the bottom of the screen, and turn around according to the predesignated amount of spins. You’ll actually have to jerk yourself around, and by the end of it, you’ll look at the bed and say, “Well, I’m already up.” At least, that’s the hope of the app developers. This one comes in handy if paired with louder alarm clocks, as well.

Any expansion or contraction of the rod caused by changes of temperature will affect the timekeeping of a pendulum; e.g., a pendulum clock with a steel rod will lose one second a day for a rise in temperature of approximately 4 °F (2.2 °C). For accurate timekeeping, the length of the pendulum must be kept as nearly constant as possible. This may be done in several ways, some of which use the differing coefficients of expansion (the amount of expansion per degree change in temperature) of different metals to obtain a cancelling-out effect. In one popular compensation method, the bob consists of a glass or metal jar containing a suitable amount of mercury. The gridiron pendulum employs rods of different metal, usually brass and steel, while in the zinc-iron tube the pendulum rod is made of concentric tubes of zinc and iron. An improved method, however, is to make the pendulum rod from a special alloy called Invar. This material has such a small coefficient of expansion that small changes of temperature have a negligible effect and can easily be compensated for if required.

A clock mechanism may be used to control a device according to time, e.g. a central heating system, a VCR, or a time bomb (see: digital counter). Such mechanisms are usually called timers. Clock mechanisms are also used to drive devices such as solar trackers and astronomical telescopes, which have to turn at accurately controlled speeds to counteract the rotation of the Earth.

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Time switches can be used to turn on anything that will awaken a sleeper, and can therefore be used as alarms. Lights, bells, and radio and TV sets can easily be used.[32] More elaborate devices have also been used, such as machines that automatically prepare tea or coffee. A sound is produced when the drink is ready, so the sleeper awakes to find the freshly brewed drink waiting.[33]
“I was looking for a small, battery-operated clock with a light for my bedside. I wake often in the middle of the night, and I do not keep my cell phone beside the bed (bad idea, as it is tempting to use it, and that does not help sleep). I had a small battery-operated clock I purchased from Walmart years ago, and it finally broke after being knocked off the bedside table too many times. … So I looked on Amazon, and this is the best replacement I could find. It is slightly larger but does the job. I push the top button and can see the time without waking my partner. Nice little clock for the price, and if I knock it off during the night and break it, it has not broken my budget!”