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French equivalent of Retard and Advance, indicating which direction to turn the pendulum regulating nut to sped up or slow down a clock. An old book written in English claimed R & A was just the initials of an inventor(s) who was developing an improved pendulum. I've never seen anything that would validate to disclaim either.

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Q: What does the R A stand for in your Westminster chime movement with R A pendulum?
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What are the limitation of simple pendulum?

The popular formula for the period of a pendulum works only for small angular displacements. In deriving it, you need to assume that theta, the angular displacement from the vertical, measured in radians, is equal to sin(theta). If not, you need to make much more complicated calculations. There are also other assumptions to simplify the formula - eg string is weightless. The swing of the pendulum will precess with the rotation of the earth. This may not work if the pendulum hits its stand! See Foucault's Pendulum (see link). The motion of the pendulum will die out as a result of air resistance. Thermal expansion can change the length of the pendulum and so its period.


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You mean that we shouldn't be able to see the light if we stand at right angle to its movement? Well, this happens with laser rays. For the non-laser light it does not happen for two reasons. First, if the source of light emits light all over the space, and you are in that space, then there is no room for you to stand in order to be at right angle to its movement. Second, even if the source of light does not emit light all over the space, and you stand at right angle to its movement, the light scatters in the air, and it comes into our eyes.


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Related questions

What are the limitation of simple pendulum?

The popular formula for the period of a pendulum works only for small angular displacements. In deriving it, you need to assume that theta, the angular displacement from the vertical, measured in radians, is equal to sin(theta). If not, you need to make much more complicated calculations. There are also other assumptions to simplify the formula - eg string is weightless. The swing of the pendulum will precess with the rotation of the earth. This may not work if the pendulum hits its stand! See Foucault's Pendulum (see link). The motion of the pendulum will die out as a result of air resistance. Thermal expansion can change the length of the pendulum and so its period.


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