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Mervyn Passmore 2005
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Pendulums are available for most types of clocks and the correct length is often stamped on the back-plate of mass produced clocks. American clocks are in inches, German in mm, and French in lignes.

For French clocks, you may find a number such as 4.2 on the backplate. Multiply the first number (the 4) by 27.02. Multiply the second number (the 2) by 2.256.  Add them together and you will have the pendulum length in millimetres. French clocks usually have the movement serial number stamped on the pendulum. If there is any discrepancy in this and the number on the backplate, and the clock cannot be regulated, it may not be the correct pendulum.